IWC Schaffhausen – PORTUGIESER Eternal Calendar Double Moon™ Platinum

IWC Schaffhausen – PORTUGIESER Eternal Calendar Double Moon™ Platinum 44.4 mm Automatic 2024  

Schaffhausen/Geneva, 2024: IWC Schaffhausen introduces the Portugieser Eternal Calendar at Watches and Wonders Geneva. Drawing on the extensive calendar expertise it has acquired since introducing the perpetual calendar almost four decades ago, IWC now pushes the boundaries once again with its first secular perpetual calendar. 

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In addition to recognising the different lengths of the months and adding a leap day every four years, the Portugieser Eternal Calendar also takes into account the Gregorian calendar’s complex leap-year exception rules. A newly engineered 400-years gear ensures that the calendar automatically skips three leap years over four centuries – an event which will occur for the first time in the year 2100. Another key feature of this watch is the extremely precise moon phase display. 

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Thanks to a newly developed reduction gear, the Double Moon™ phase display will only deviate from the moon’s orbit by one day after 45 million years. The Portugieser Eternal Calendar features an intricately finished platinum case and a black alligator leather strap from Santoni. The extensive use of glass elements such as a glass dial and double box-glass sapphire crystals showcases the ingenious mechanism inside. The increased transparency also creates a unique sense of lightness, airiness and understated elegance.

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Translating the irregular calendar into a mechanical program for a wristwatch remains one of the most challenging engineering feats in fine watchmaking. The Gregorian calendar, which is used across most continents and cultures today, divides the year into twelve months with 28, 30 or 31 days. Years that are divisible by four count as leap years, meaning that a 29th day must be added at the end of February. However, an additional correction is needed to keep the calendar in sync with the actual solar year: only those centurial years that can be divided by 400 are leap years, all others are common years. This means that 2000 and 2400 are leap years, while 2100, 2200 and 2300, for example, are common years. 

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A traditional perpetual calendar, however, is only programmed for a four-year cycle, in which three common years are always followed by a leap year. By design, it will interpret the year 2100 as a leap year and need a correction. The same will happen again in 2200 and 2300. As a result, a perpetual calendar will need three corrections over a period of 400  years. A secular perpetual calendar like the Portugieser Eternal Calendar (Ref. IW505701), on the other hand, is mechanically programmed to take these complex nuances into account. It will calculate the leap year correctly until at least the year 3999, as it has not yet been officially decided whether the year 4000 will be a leap year or not.

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    “Since Kurt Klaus developed his legendary perpetual calendar in the 1980s, IWC Schaffhausen has accumulated unique expertise in mechanical calendars that are ingeniously efficient in their design and easy to use. With the new Portugieser Eternal Calendar, we now venture further than ever before, touching the limits of eternity. Our first secular perpetual calendar automatically takes into account the Gregorian calendar’s complex leap-year exception rules by skipping the leap year three times over 400 years. True to the spirit of engineers who are always pushing the boundaries, we have also fitted this technical marvel with a moon phase display that will only deviate from the moon’s orbit by one day after 45 million years"

 Chris Grainger-Herr, CEO of IWC Schaffhausen

 THE 400-YEARS GEAR SKIPS THREE LEAP YEARS IN FOUR CENTURIES

The Portugieser Eternal Calendar is based on the same modular and synchronised design as the existing perpetual calendar. All its displays can be advanced using the crown. However, while the perpetual calendar is programmed for a four-year cycle, the Portugieser Eternal Calendar features an additional mechanism. Every four years at the end of February, a new module informs the calendar about whether the leap year takes place or not. 

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This so-called 400-years gear completes only one revolution every four centuries. It contains three indentations, which cause the calendar to skip three leap years over that period. This module is designed with impressive efficiency and technical elegance and consists of only eight parts, underscoring IWC Schaffhausen’s engineering approach to fine watchmaking.

MOON PHASE WITH A CALCULATED ACCURACY OF 45 MILLION YEARS

Since the introduction of the perpetual calendar almost four decades ago, IWC has also taken great strides to continuously improve the accuracy of its moon phase displays. 

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While the Da Vinci Perpetual Calendar Chronograph (Ref. IW3750) from 1985 featured a moon phase precision of 122 years, the first Portugieser Perpetual Calendar (Ref. IW5021) from 2003 impressed with a moon phase accuracy of 577.5 years. IWC’s engineers have now taken on the challenge to develop a new moon phase display with unprecedented precision.

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The difficulty in displaying the moon phase on the dial of a watch lies in the fact that the moon does not follow a daily rhythm in its orbit around the Earth. A cycle from new moon to new moon – one lunation – does not last 30 days, but rather 29 days, 12 hours, 44 minutes, and 2.88 seconds. The duration of one calendar month must therefore be reduced as close as possible to one lunar cycle. This is achieved by placing a reduction gear between the base movement and the moon phase disc. 

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The key to high precision lies in the quantity of wheels used, their proportions and the number of teeth they have. IWC’s engineers have now used a special computer program to simulate more than 22 trillion different combinations.

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For the Portugieser Eternal Calendar, they came up with a new reduction gear train using three intermediate wheels. Mathematically, the display will only deviate from the moon’s orbit by one day after 45 million years. Another challenge consisted in integrating this new gear train into the confined space of the eternal calendar module.

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The moon phase is displayed on the dial using the characteristic Double Moon™ indication, which shows the moon as seen from the Northern and Southern hemispheres. The display consists of two super-imposed discs. A celestial disc with two small circular openings rotates above an immobile lower disc with two dots. 

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This negative representation gives the impression that two small moons are waxing or waning. Here, the lower disc is made of titanium and decorated with a Guilloché pattern. The upper disc is made of glass.

INTRICATELY CRAFTED GLASS DIAL AND DOUBLE BOX-GLASS

The Portugieser Eternal Calendar features an intricately finished platinum case with polished and brushed surfaces. Another highlight is the glass dial, which is manufactured in a complex process. In the first step, the underside of the dial is frosted and lacquered in white. 

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The subdials are machined and polished separately and subsequently fixed onto the dial. In the next step, the printing is applied, and the appliques are mounted by hand. The depth of the glass lends the print and appliques a floaty lightness. The numerals and the characteristic Portugieser minute scale are printed on a white lacquered flange sitting between the glass dial and the front glass. 

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The box-glass sapphire crystals are machined and polished in an elaborate process. 

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The Portugieser Eternal Calendar is fitted with a black alligator leather strap from the Italian leather artisan Santoni with a platinum folding clasp.

IWC-MANUFACTURED 52640 CALIBRE 
WITH SEVEN DAY POWER RESERVE

At work inside the platinum case is the newly developed IWC-manufactured 52640 calibre. The high-end calibre features a highly efficient Pellaton winding system. Using movements of the rotor in both directions, it reliably builds up a power reserve of seven days (168 hours) in the two barrels. 

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Parts of the winding system that are subject to extremely high stresses are manufactured using virtually wear-free zirconium oxide ceramic. The movement has been elaborately finished with circular graining and Geneva stripes and can be admired through the box-shaped sapphire glass case back.

THE WORLD’S MOST PRECISE LUNAR PHASE WRISTWATCH: THE IWC SCHAFFHAUSEN PORTUGIESER ETERNAL CALENDAR NOW HOLDS THE GUINNESS WORLD RECORDS™ TITLE

Schaffhausen/London, 26th June 2024: The newly introduced Portugieser Eternal Calendar has been officially recognised by Guinness World Records as the “most precise lunar phase wristwatch”. 

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With a theoretical deviation of just one day in 45,361,055 years, the Double Moon™ indication of the Portugieser Eternal Calendar beats the previous world record by more than 43 million years. This is made possible by a new reduction gear train with three intermediate wheels, which reduces the duration of one calendar month as precisely as possible to the duration of one complete lunar cycle.

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The moon phase display is arguably the most charming complication in watchmaking. It displays the current phase of the moon on the dial, ensuring that no full moon is missed – even if it is obscured by clouds. Since the introduction of its perpetual calendar almost four decades ago, IWC Schaffhausen has taken great strides to continuously improve the accuracy of its moon phase displays. 

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Developed by IWC Schaffhausen’s former head watchmaker Kurt Klaus, the first perpetual calendar debuted in 1985 with the Da Vinci Perpetual Calendar Chronograph (Ref. IW3750) and offered a moon phase accuracy of 122 years. In 2003, IWC introduced the Portugieser Perpetual Calendar (Ref. 5021), featuring a moon phase display with an enhanced precision of 577.5 years. 

Click, to see the large size. ▶ BIG FOTO  The new Portugieser Eternal Calendar pushes the boundaries again: with a theoretical accuracy of more than 45 million years, it has now been officially recognised as the “world’s most precise lunar phase wristwatch” by Guinness World Records (GWR). Established in 1955, GWR has evolved to the globally most recognised authority on record-breaking achievements – verifying and documenting both human and natural records. Before being awarded its title, each record is carefully audited to comply with their strict quality standards and needs go undergo a rigorous verification process.

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    The moon phase of the Portugieser Eternal Calendar exemplifies the culture of engineering and innovation we live every day at IWC. From our apprentices and trainees to our most experienced watchmakers and engineers, we are continuously pushing the boundaries of what is possible in fine watchmaking. This record is a great recognition of their hard work and our watchmaking expertise

Stefan Ihnen, Associate Director Technics of IWC Schaffhausen

DISPLAYING THE MOON PHASE PRECISELY IS A CHALLENGE 

In the moon phase display, a reduction gear train is placed between the base calendar module and the moon phase disc. This gear train reduces the duration of one calendar month to the duration of one synodic month, which equals 29 days, 12 hours, 44 minutes and 2.88 seconds. 

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The accuracy of the display depends on the number of wheels used, their proportions and the number of teeth they have. For the Portugieser Eternal Calendar, IWC’s engineers devised a new reduction gear with three intermediate wheels – two more than in the previous module with an accuracy of 577.5 years.

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To develop a solution that is sufficiently robust and will function reliably for extremely long periods of time, they defined key parameters such as the minimum and maximum number of teeth per wheel. A computer simulation program created specifically for this purpose was then tasked with calculating almost 23 trillion different combinations of wheels and teeth. In an iterative process, the engineers gradually worked their way towards the perfect combination of wheels for this specific application. 

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Assuming a constant duration of the synodic month of 29 days, 12 hours, 44 minutes and 2.88 seconds, the display would theoretically only deviate from the orbit of the moon by one day after 45,361,055 years.

LIGA PROCESS OFFERED THE REQUIRED PRECISION

Calculating the wheels was, however, not the end of the story. In order to achieve an even higher display accuracy, the backlash between the wheels was minimised by optimising the tooth geometry. To ensure that the tiny components function reliably over extremely long periods of time, alternative approaches also had to be adopted in manufacturing. 

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As traditional metal machining would not have offered the precision needed, IWC’s engineers opted for the so-called LIGA process to manufacture the wheels. LIGA involves lithography, electroplating and moulding and is often used in the semiconductor industry. 

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This process permits the production of exceptionally homogenous and smooth microstructures with a degree of precision that conventional manufacturing capabilities would not even be remotely capable of.

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TECHNICAL SPECIFICATIONS

Model:   PORTUGIESER Eternal Calendar Double Moon™  

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 Ref. IW505701 - Platinum 

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FEATURES

• Mechanical movement
  – Pellaton automatic winding system
  – Power reserve display
  – Secular perpetual calendar with displays for the date, day, month, year in four digits
  – Perpetual moon phase with 45,000,000 years accuracy for both northern and southern hemispheres
  – 400-years gear for the recognition of irregular leap years
  – Small hacking seconds
  – Rotor in 18-carat gold
  – See-through sapphire glass back
  

MOVEMENT
IWC-manufactured  calibre 52640
Frequency:    28,800 A/h | 4 Hz
Jewels:    54
Power reserve:  7 days (168 h)
195 Components
Winding:    Automatic  

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WATCH
Materials: Platinum
Diameter:    44.40 mm
Height:    15.00 mm
Water-resistant:    5 bar 
DIAL
White dial. Glass dial with white lacquer
Rhodium-plated hands and appliques
Day & Night indication in the shape of a globe at 9 o’clock
Glass:  Sapphire, double box-glass, antireflective coating on both sides
STRAP
Black alligator leather strap by Santoni
Distance between horns: 22.0 MM
Platinum folding clasp

🔴 Public price:   CHF 150'000 / 156,500 EUR / $ 160,000 💰Guide price

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Further Information
IWC Schaffhausen Baumgartenstrasse 15 · CH-8201 Schaffhausen
Phone +41 (0)52 235 75 65 · Fax +41 (0)52 235 75 01 · press@iwc.com ·

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Press releases - 2024
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IWC Schaffhausen
Baumgartenstrasse 15 ·
CH-8201 Schaffhausen
Phone +41 (0)52 235 75 65 ·
Fax +41 (0)52 235 75 01 ·
Mobile  +41 (0)79 957 72 52
E-mail  info@iwc.com
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IWC – PORTUGIESER Hand-Wound Tourbillon Day & Night Armor Gold

IWC Schaffhausen – PORTUGIESER Hand-Wound Tourbillon Day & Night Black Dial 42.4 mm Armor Gold® 2024  

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 THE IWC SCHAFFHAUSEN PORTUGIESER HAND-WOUND TOURBILLON WITH A GLOBE-SHAPED DAY AND NIGHT INDICATION

Schaffhausen/Geneva, 9^th April 2024: IWC Schaffhausen introduces the Portugieser Hand-Wound Tourbillon Day & Night at Watches and Wonders Geneva. It combines an 18-carat Armor Gold^® case with an Obsidian lacquered dial and gold-plated hands and gold appliques. The flying minute tourbillon at 6 o’clock consists of 56 parts and weighs only 0.675 grams. Another highlight is the innovative day and night display, which shows the eternal cycle of day and night with the help of a small sphere rotating around its axis. The globe-shaped day and night indicator is visible both from the dial and the movement side. The hand-wound IWC-manufactured 81925 calibre with gold-plated components can be admired through the sapphire glass case back.

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The Portugieser stands out not only because of its pure and timeless design. The collection is also a testament to IWC Schaffhausen’s comprehensive expertise in fine watchmaking. Over the years, the Swiss luxury watch manufacturer has presented many Portugieser watches with high complications, ranging from different versions of its perpetual calendar and tourbillons to the astronomical displays of the Portugieser Sidérale Scafusia – to this day the most complicated watch ever made by IWC Schaffhausen. With its unique engineering approach to fine watchmaking, IWC develops complications that are ingenious, highly robust and reliable, and technically elegant in their design. 

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Adding to its legacy of high complications, IWC presents the Portugieser Hand-Wound Tourbillon Day & Night (Ref. IW545901) with a polished and brushed 18-carat Armor Gold^® case, gold-plated hands, and gold appliques. Thanks to its improved microstructure, Armor Gold^® is significantly harder and more wear resistant than conventional 5N gold. 

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The Obsidian black and highly polished dial radiates a tremendous depth and creates a beautiful contrast. The watch is fitted with a finely crafted curved black alligator leather strap from Santoni, a renowned Italian manufacturer of luxury shoes and leather accessories. 

 

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The flying minute tourbillon at 6 o’clock is one of the most sophisticated complications in watchmaking. Assembling and finetuning this delicate mechanism is a task reserved for the most experienced master watchmakers at IWC Schaffhausen. 

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The tourbillon places the balance wheel and pallet lever inside a small cage that rotates around its axis once every minute. This constant rotation reduces the influence of gravity on the oscillating system of the watch, thereby increasing its accuracy. As the tourbillon cage is stopped and accelerated several times per second, its total weight must be as low as possible. Although the mechanism consists of 56 individual parts, it only weighs 0.675 grams in total. The pallet lever and escape wheel are made of silicon and treated with a special diamond coating. 

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This Diamond Shell^® technology reduces friction and improves the flow of energy in the movement, contributing to the high power reserve of 84 hours. Thanks to the integrated tourbillon stop, the mechanism can be brought to a complete stop and the watch set with down-to-the-second accuracy.

A UNIQUE WAY TO SHOW THE ENDLESS CYCLE OF DAY AND NIGHT 

Another highlight can be found at 9 o’clock: the 24-hour indication in the shape of a small planet. The globe has a dark and a bright side and rotates around its axis once every 24 hours, offering a captivating visualisation of whether it is currently day or night. The idea for this special day and night concept came from former watchmaker trainee Loris Spitzer and is a testament to the success of IWC’s trainee program and the culture of curiosity and innovation that the company fosters. 

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The day and night indication is integrated into the newly developed IWCmanufactured 81925 calibre. As the movement is handwound and has no oscillating mass, the small globe is visible from the front and back. The gold-plated base plate is partly skeletonised to offer an unimpeded view of the barrel and other components. 

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The movement is elaborately finished with circular Geneva stripes and can be admired through the sapphire glass case back.

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TECHNICAL SPECIFICATIONS

Model:   PORTUGIESER Hand-Wound Tourbillon Day & Night  

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 Ref. IW545901 

FEATURES

• Mechanical movement
  – Flying hacking minute tourbillon at 6 o’clock
  – Day & Night indication in the shape of a globe at 9 o’clock
  – See-through sapphire glass back
  

MOVEMENT
IWC-manufactured  calibre 81925
Frequency:    28,800 A/h | 4 Hz
Jewels:    22
Power reserve:   84 h
195 Components
Winding:    Manual-winding
WATCH
Materials: 18 ct Armor Gold®
Diameter:    42.40 mm
Height:    10.80 mm
Water-resistant:    6 bar 
DIAL
Obsidian Black
Flying hacking minute tourbillon at 6 o’clock
Day & Night indication in the shape of a globe at 9 o’clock
Glass:  Sapphire, arched edge, antireflective coating on both sides
STRAP
Black alligator leather strap by Santoni
Distance between horns: 22.0 MM
Gold folding clasp

🔴 Public price:   CHF 80'000 /87,500 EUR / $ 79,300 💰

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Further Information
IWC Schaffhausen Baumgartenstrasse 15 · CH-8201 Schaffhausen
Phone +41 (0)52 235 75 65 · Fax +41 (0)52 235 75 01 · press@iwc.com ·

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Press releases - 2024
------------------------------
IWC Schaffhausen
Baumgartenstrasse 15 ·
CH-8201 Schaffhausen
Phone +41 (0)52 235 75 65 ·
Fax +41 (0)52 235 75 01 ·
Mobile  +41 (0)79 957 72 52
E-mail  info@iwc.com
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IWC – PORTUGIESER Chronograph Year of the Dragon Edition

 

IWC Schaffhausen – PORTUGIESER Chronograph Automatic Year of the Dragon Edition 2024  

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Schaffhausen/Shanghai, 8th January 2024: To celebrate the beginning of the Year of the Dragon, IWC Schaffhausen presents a limited edition of the Portugieser Chronograph. The classic and elegant Portugieser Chronograph Year of the Dragon features a 41-millimetre stainless steel case, a burgundy dial and contrasting gold-plated hands and appliques. Limited to 1000 pieces, this watch impresses with its rotor in the form of a majestic dragon, visible through the sapphire glass case back.

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True to tradition, IWC Schaffhausen welcomes the Lunar New Year with a special edition watch. 10th February 2024 marks the beginning of the Year of the Wood Dragon. According to the Chinese calendar, such a combination only occurs once every 60 years. People born under the sign of the dragon are considered energetic, strong, confident, gifted, intelligent and generous. Dragons initiate big things and keep them running. The Year of the Dragon promises luck, prosperity, and economic success. 

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“Since 1998, the Portugieser Chronograph has embodied the dynamic, sporty side of IWC Schaffhausen’s acclaimed Portugieser collection. Thanks to the dial layout with the vertically arranged counters and the quarter-seconds precision scale, it has become one of our most coveted designs. We are convinced it is a fitting model to welcome the Year of the Dragon”, said Peter Lao, Managing Director of IWC Schaffhausen China.

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The Portugieser Chronograph Year of the Dragon (Ref. IW371629) features a 41-millimetre stainless steel case, a burgundy dial, and gold-plated hands and appliques. Burgundy is a charming shade of red, symbolising the vibrant colour of fire, which is traditionally used to welcome the Lunar New Year in China and promises longevity and luck. The chronograph is powered by the IWC-manufactured 69355 calibre, a robust and precise mechanical chronograph movement in a classic column-wheel design.

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A glance at the movement through the transparent sapphire case back reveals another highlight: the gold-plated rotor of the automatic winding system takes the form of a beautifully detailed dragon. In addition, the case back ring features an engraving of “2024 YEAR OF THE DRAGON.” 

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The Portugieser Chronograph Year of the Dragon is delivered with two straps: one black calfskin strap and one burgundy rubber strap, allowing the wearer to choose between two different looks. A butterfly clasp ensures excellent wearing comfort.
 
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The Portugieser Chronograph Year of the Dragon is limited to 1000 pieces and available immediately through IWC boutiques, authorised retail partners, or online at IWC.com. In addition, the timepiece is eligible for registration under the My IWC care programme, benefitting from a 6-year extension to the standard 2-year International Limited Warranty.

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TECHNICAL SPECIFICATIONS

Model: PORTUGIESER Chronograph Year of the Dragon Edition

Ref.  IW371629   

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FEATURES
Mechanical chronograph movement
– Stopwatch function with minutes and seconds
– Small hack - ing seconds – See-through sapphire glass back
MOVEMENT
IWC-manufactured calibre 69355
Frequency:    28,800 A/h | 4 Hz
Jewels:    27
Power reserve:    46 h
Components    206    
 Winding:    Automatic

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WATCH
Materials: Stainless-steel case 
Diameter:    41.00 mm
Height:    13.10 mm
Water-resistant:    3 bar 
DIAL
Burgundy dial
Gold-plated hands and appliques
Glass:    Sapphire, convex, antireflective coating on both sides
STRAP
Individualisation strap.
Black calfskin strap, burgundy rubber strap.
Strap width 20.0 mm.
Folding clasp in stainless steel

🔴 Price: US$ 9.350 / EUR 10,100  💰

🔰Limited to 1000 pieces 

 WARRANTY  6-year extension to the standard 2-year International Limited Warranty. 

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Further Information
IWC Schaffhausen Baumgartenstrasse 15 · CH-8201 Schaffhausen
Phone +41 (0)52 235 75 65 · Fax +41 (0)52 235 75 01 · press@iwc.com ·

------------------------------
Press releases - 2024
------------------------------
IWC Schaffhausen
Baumgartenstrasse 15 ·
CH-8201 Schaffhausen
Phone +41 (0)52 235 75 65 ·
Fax +41 (0)52 235 75 01 ·
Mobile  +41 (0)79 957 72 52
E-mail  info@iwc.com
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