SEIKO – PROSPEX Marinemaster 1968 Heritage Diver’s Watch JAMSTEC Edition

SEIKO – PROSPEX Marinemaster 1968 Heritage Diver’s Watch JAMSTEC Edition 2026

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 The Prospex Marinemaster upholds Seiko’s longstanding
legacy of bold exploration in a collaboration with JAMSTEC.

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Seiko’s journey in diver’s watchmaking began in 1965 with Japan’s first diver’s watch, which accompanied members of the Japanese Antarctic Research Expedition to the South Pole from 1966 to 1969. 

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His model was followed by the creation of the nation’s first 300m water-resistant diver’s watch in 1968. In the decades since, Seiko has developed new technologies, designs, and features that have made its diver’s watches a trusted favorite among professionals and enthusiasts worldwide.

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The company’s legacy of testing the limits of the modern sports watch and supporting marine conservation continues through its partnership with the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), which began in the 1980s. 

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In 1983, two professional diver’s watches rated to 600 meters were successfully tested aboard SHINKAI 2000, a manned research submersible operated by JAMSTEC.

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For decades, JAMSTEC has been engaged in marine research to advance science and technology and promote academic progress through various initiatives. One such effort is the Arctic Research Program. 

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As part of this, Japan’s first research vessel with ice breaking capabilities, Mirai II (the word mirai means “future” in Japanese), will be completed this year, enabling data collection in ice-covered seas.

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Inspired by the spirit of bold exploration that connects JAMSTEC and Seiko, two new diver’s watches join Prospex’s flagship Marinemaster series. The first is a JAMSTEC collaboration, and the second is a continuous production model. 

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Both are powered by Seiko’s self-winding Caliber 8L45 mechanical movement and represent the pinnacle of the Seiko 300m water-resistant diver’s watch. 

Honoring a spirit of exploration and forging new paths 

The collaboration model showcases a new textured dial that imagines the trail forged by an icebreaker as it advances through sea ice, symbolizing how Arctic research paves the way for the future. 

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Its vertically oriented blue gradient, which deepens at the center, is finished with a thick, clear coating and then polished, echoing the boundless, crystalline depth of the Arctic Ocean. 

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The blue ceramic bezel enhances the beauty of the dial while providing exceptional scratch resistance.

The ultimate expression of a classic Seiko diver’s watch

As the first continuous production Prospex watch powered by the 8L45 movement, the new black-dialed creation embodies the classic 1968 diver’s design, ensuring exceptional legibility underwater. 

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The dial’s deep black hue and fine-grain texture minimize light reflection from the dial while the beveled edges of the indexes catch light from any angle, delivering high visibility.

An evolution of the Marinemaster

Both creations feature an updated clasp that offers easy adjustments of up to 16mm in 2mm increments by sliding the button inside. Even when the clasp is closed, the extension can be retracted, ensuring comfortable and effortless operation. 

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While its exterior traces the familiar contours of the 1968 diver’s watch—including its flowing silhouette and a screw-down crown at 4 o'clock—the Caliber 8L45 that powers the watches represents the summit of Seiko’s mechanical watch movements. The mainspring and hairspring are made of Spron, Seiko’s proprietary alloy. 

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The movement offers 72 hours of power reserve thanks to a mainspring that is long and thin, and operates within a tolerance of +10 to -5 seconds per day. To ensure the watch's durability, the crown is not screwed directly into the case but locked into a separate component that is built into the case, allowing it to be more easily replaced. 

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The two creations will be available at the Seiko Boutiques and select retail stores worldwide from July 2026, with the JAMSTEC collaboration model offered as a limited edition of 1,000. 

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About JAMSTEC

The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) is a national institute for comprehensive marine research and development dedicated to advancing innovative science and technology. JAMSTEC fosters academic progress, and deepens understanding of the Earth and life, while contributing to the sustainable development of society and the preservation of the global environment. Using data obtained through its research, JAMSTEC strives to address societal and economic needs and drive innovation across multiple sectors.

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TECHNICAL SPECIFICATIONS 

SPORT - Collection

Model: PROSPEX Marinemaster 1968 Heritage Diver’s Watch

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Reference: HBF001j1

Case
    Material: Stainless steel with super-hard coating
    Diameter: 42.60 mm
    Thickness: 14.10 mm
    Dual-curved sapphire crystal with anti-reflective coating on the inner surface
    Bezel with ceramic insert
    Screw-down crown, screw case back
    Water-resistant to 300 meters
    Magnetic resistance: 4,800 A/m
Dial 
    Black grained dial
    Lumibrite on hands and indexes
Movement
    Caliber 8L45

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Driving system: Automatic
    Frequency: 28,800 vibrations per hour (8 beats per second)
    Number of jewels: 35
    Power reserve of 72 hours
Functions
    Hours, minutes, seconds, date
Strap 
    Stainless steel bracelet with super-hard coating
    Three-fold clasp with push button release, solid & slide adjuster

🔴Price:  3.600 USD / EUR 3.800 €💰

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TECHNICAL SPECIFICATIONS 

SPORT - Collection

Model:  PROSPEX Marinemaster 1968 Heritage Diver’s Watch JAMSTEC Limited Edition

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Reference: HBF002j1 

Case
    Material: Stainless steel with super-hard coating
    Diameter: 42.60 mm
    Thickness: 14.10 mm
    Dual-curved sapphire crystal with anti-reflective coating on the inner surface
    Bezel with ceramic insert
    Screw-down crown, screw case back
    Water-resistant to 300 meters
    Magnetic resistance: 4,800 A/m
Dial
    Blue gradient textured dial
    Lumibrite on hands and indexes
Movement
    Caliber 8L45
    Driving system: Automatic
    Frequency: 28,800 vibrations per hour (8 beats per second)
    Number of jewels: 35
    Power reserve of 72 hours
Functions
    Hours, minutes, seconds, date
Strap 
    Stainless steel bracelet with super-hard coating
    Three-fold clasp with push button release, solid & slide adjuster

 Release 2026

🔰 Edition of ✅only ❱❱❱ 1.000 pieces

🔴price:  3.900 USD / EUR 3.700 €💰

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Press releases - 2026
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SEIKO WATCH CORPORATION
Mr­­ Noboru­­ Miyadera
2-8-10, Toranomon, Minato-ku,
Tokyo­­ 105-8467
Japan
Telephone+81 3 6739 2150
Telefax+81 3 6739 2071
seiko-pr@seiko-watch.co.jp
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www.SeikoWatches.com

SEIKO x BAMFORD 5 Sports SBSA315 Exclusive Edition

SEIKO x BAMFORD 5 Sports SBSA315 Exclusive Edition 2025

 The iconic SEIKO 5 Sports collaborates with BAMFORD,
London’s luxury custom watch brand, to present a daring limited-edition model.

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Bamford Watch Department is a London-based watchmaker founded in 2003 by George Bamford.
Renowned as a pioneer in the world of custom watches, the brand transforms traditional luxury timepieces with exceptional craftsmanship and a distinctive customization approach.

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Created under the concept envisioned by George Bamford—renowned custom watch pioneer and founder of Bamford Watch Department—this model invites wearers on a journey to “paradise,” a world of freedom and refreshment away from the hustle and bustle of everyday life.

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Based on the ever-popular SKX series, the design reinterprets Seiko archive models using collage techniques. The result is a one-of-a-kind limited edition that fuses nostalgia with a futuristic spirit, offering a playful and imaginative take on retro-futurism.

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Featuring a blue skeleton dial, this model incorporates the indexes and hands once used in the 1980s SKX series. The ocean-inspired translucent dial embodies George Bamford’s vision of duality—of what is seen and unseen, of the present and the timeless—capturing two worlds in one design.

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The bezel insert recreates a classic Seiko archive design using a lustrous material that blends a sense of nostalgia with a futuristic feel. The “BAMFORD” logo is subtly placed at the 6 o’clock position on the dial and on the clasp of the nylon strap, adding a discreet signature touch.

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The indexes and hands are coated with Lumibrite. By incorporating fluorescent accents throughout the design—including the bezel, hands, and nylon strap—the watch reveals a different expression under black light.

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The case back is marked with the words “LIMITED EDITION” and a serial number to signify its exclusivity, along with the printed “BWD” logo, representing Bamford Watch Department. 

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The special presentation box is a tribute to the packaging used in the 1960s and features a distinctive design with the BAMFORD logo printed on it. 

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TECHNICAL SPECIFICATIONS 

SPORT Collection - Collaboration 5 Sports

Model:    SKX series

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 Ref:  SBSA315

Movement
Caliber Number    4R36
Movement Type    Automatic with manual winding
Precision   +25 to -15 seconds per day
Power reserve    Approx. 41 hours
Jewels    24
Functions

• Stop second hand function
• Day/Date display

Сase/Band
Case 

Stainless steel
Thickness:13.4mm
Diameter:42.5mm
Lug-to-lug:46.0mm
Crystal    Box shaped sapphire crystal
Crystal   Curved Hardlex
LumiBrite   LumiBrite on hands, index(es) and bezel
Band Material   Nylon
Distance between lugs     19mm
Water Resistance    10 bar
Magnetic Resistance    4,800 A/m
Weight    93.0g
Dial
Blue translucent dial

Indexes: Applied markers, and opening over the day-date; Classic SKX hands rendered in silver and orange
Lume: LumiBrite on hands, hour markers, and day disc

Strap: NATO strap in black with light blue and luminous orange stripe

Features

• LIMITED EDITION on the case back
• Serial number engraved on the case back
• Unidirectional rotating bezel
• See-through & Screw case back

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BAMFORD Limited Edition, Seiko Boutique exclusive model

October 2025 Release

🔰 Edition of ✅only to 2.025 pieces

🔴price:  460 USD / EUR 480 €💰

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Press releases - 2025
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SEIKO WATCH CORPORATION
Mr­­ Noboru­­ Miyadera
2-8-10, Toranomon, Minato-ku,
Tokyo­­ 105-8467
Japan
Telephone+81 3 6739 2150
Telefax+81 3 6739 2071
seiko-pr@seiko-watch.co.jp
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www.SeikoWatches.com

CREDOR – Goldfeather Tourbillon Platinum Edition

CREDOR – Goldfeather Tourbillon "The Birds soaring into the Sky" Lacquer Techniques Urushi by Isshu Tamura Platinum Edition - 2025

 Credor soars with the masterful expression of diverse urushi
lacquer techniques in a new Goldfeather tourbillon.

Since its birth in 1974, Credor has embodied sophisticated craftsmanship and refined elegance. Derived from the French crête d’or, or “crest of gold,” the Credor name has long stood for the highest echelon of watchmaking artistry. The Goldfeather, first launched in 1960, was reborn in 2023 as the Credor Goldfeather, a modern dress watch that strives to embody the qualities of a feather: thin, light, smooth, elegant, and graceful.

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Today, the Credor Goldfeather reaches new heights of beauty and performance through a rich combination of urushi lacquer and, for the first time in a Goldfeather watch, a tourbillon.

A harmony of urushi lacquer techniques

The dial captures the image of birds soaring into the sky, their ascent tracing a trajectory from the tourbillon carriage at the nine o’clock position to the Credor logo at 12 o’clock. The birds are brought to life through two techniques that are part of Japanese urushi craftsmanship: raden, in which mother-of-pearl in varying colors is delicately inlaid on the lacquered dial, creating a beautiful shimmer against the dark urushi backdrop; and kirikane, a decorative art that involves cutting gold plate into fine lines or shapes and applying it to surfaces. In creating the dial, urushi artisan Isshu Tamura carefully applies each portion of mother-of-pearl and gold plate, which differ in thickness, making controlled layering essential to achieving harmony between the two. 

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He then shaves down the surface with extraordinary precision to create an even finish and bring out the ideal color. This meticulous craftsmanship produces a smooth surface and a depth within the thin lacquer layer, creating a gradation of color that arcs across the soft curve of the dial and evokes the boundless beauty of the sky. The gold flecks encircling the tourbillon carriage are crafted in maki-e, a technique in which gold powder is sprinkled onto the lacquer, with the tourbillon’s motion symbolizing the radiant energy of the sun. The tourbillon bridge assumes the shape of a bird in flight with outstretched wings. 

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The new Caliber 6850 movement, visible through the sapphire crystal case back, features a dynamic design inspired by the primary feathers that generate lift as a bird ascends into the sky. The motif is expressed through a combination of bold and delicate engraving, as well as raden and maki-e, with the design radiating outward from the tourbillon carriage, echoing the story on the dial.

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 Requiring no screws, the newly developed case achieves a seamless form.

Hand-applied by a dedicated team of engravers, the grooves are carved with tools of different shapes to give each feather a depth of its own, creating a three-dimensional landscape within just 0.15mm. The tempered blue screws and the greenish-blue hue of the outer feather made with raden and maki-e enhance the overall harmony and striking presence of the design. The raden used in this feather is made of yakougai, the shell of the green turban snail.

A new tourbillon movement meets a new Goldfeather case 

This timepiece houses the new tourbillon Caliber 6850, the successor to Caliber 6830, which was introduced in 2016. Maintaining the same compact dimensions as Caliber 6830 (25.6mm in diameter and 3.98mm in thickness), the new movement features an enlarged mainspring barrel that extends the power reserve to 60 hours.

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The movement is assembled by master watchmaker Katsuo Saito, who in 2023 received the Medal with Yellow Ribbon, an honor bestowed by the Japanese government upon individuals who have become public role models through their diligence and perseverance in their professions. The movement’s thinness, combined with the extremely small components within the tourbillon carriage, demands exceptional skill at every stage of assembly, adjustment, and mounting. The adjustment of parts such as the spring and pallet fork requires a precision of one-hundredth of a millimeter. Adjusting the space between parts also requires a high level of precision.

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The Credor logo, name, and Goldfeather letters are rendered in raised maki-e. 

While housing a tourbillon movement and featuring Goldfeather’s signature curved form, this creation maintains its slim profile of 8.6mm thanks to a newly developed case. With the mid-case, lugs, and the part of the back that is not sapphire crystal all formed as one part, the design offers a streamlined silhouette. The case is made of Platinum 950, a material that is difficult to polish. Sparing no effort, the case is hand-polished and finished by skilled artisans to ensure smooth surfaces and comfort on the wrist, as well as uncompromising beauty.

This new Goldfeather will be available as a limited edition of 10 starting in October 2025.

Urushi Lacquer Artisan
Isshu Tamura

After mastering the traditional Kaga maki-e technique, which originated in the Kaga Domain (now Kanazawa, Ishikawa Prefecture), Tamura set out to produce his own works of art characterized by unparalleled and intricate beauty. 

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His exquisite artistry, achieved through exceptionally detailed craftsmanship, has earned high acclaim around the world. 

Watchmaker
Katsuo Saito

Katsuo Saito has been involved in the assembly, adjustment, and repair of high-end mechanical watches since 2002. In 2017, Saito was awarded the title of Contemporary Master Craftsman (Ministry of Health, Labour and Welfare), and in 2023, he received the Medal with Yellow Ribbon.

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One of the few watchmakers capable of assembling the ultra-thin Caliber 68, he trains future watchmakers and shares his expertise through global seminars and demonstrations. 

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TECHNICAL SPECIFICATIONS

Collection: Goldfeather 

Model: Goldfeather Tourbillon 

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Reference: GBCF999 
Estimated Release Date: October, 2025 

Case
38.6mm(Diameter)
45.2mm(Lug-to-lug) 8.6mm(Thickness) 
950 platinum case
Glass: Box shaped sapphire crystal with anti-reflective coating on inner surface
Sapphire caseback
Water-resistant: 3 bar Splash Resistant 
Weight: 140.0g
Dial
Urushi lacquer, Kirikane, Raden (mother-of-pearl inlay), Maki-e inlay 
18k yellow gold hand
Carriage tourbillon at the nine o’clock 
Movement:
Hand-wound - fully engraved by hand
Calibre 6850 - in-house
22 jewels
4,500 vibrations per hour (6 beats per second)
60h power reserve 
Diameter: 25.6mm, Thickness: 3.98mm
Accuracy: +15 to -10 seconds per day
Hours, minutes, Tourbillon 
Strap
Crocodile leather (Black Musou Tailoring)
Platinum 950 three-fold clasp (partially made of PT 900) with push button release 

🔰Limited Edition ✅ Only 10 Pieces starting in October 2025.
🔴 Price: Recommended retail price in Europe:  EUR 190,000) 💰

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Press Release - 2025
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SEIKO – PROSPEX Land Mechanical GMT Edition

SEIKO – PROSPEX Land Mechanica GMT Edition 2023

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 A faithful re-creation of an archival model from 1968

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For its latest watch, Seiko Prospex has re-created the model from 1968 that was Seiko’s first GMT to feature a rotating bezel. 

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The new limited edition is as faithful as possible to the classic sports design and compact dimensions that characterized the late-‘60s Navigator Timer. A distinctive five-row bracelet glitters to complete the watch’s classic and luxurious look.

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On the dial, the Seiko logo follows the design of the original model and is lower in height than the current logo. The GMT, hour, and minute hands, as well as the indexes, also follow the Navigator Timer design. 

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With its independently adjustable GMT hand and 24-hour rotating bezel, this handsome traveler’s watch displays the time in three places at once.  

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Seiko introduces Caliber 6R54, a new movement in the long-trusted 6R family with a GMT function and power reserve extended to 72 hours.

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The case back bears a horseshoe-shaped design similar to the original model and displays the individual watch's serial number.

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TECHNICAL SPECIFICATIONS 

SPORT - Collection

Model:  PROSPEX Land Mechanical GMT Edition

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 Ref: SPB411j1

• 
  

Movement
Caliber Number    6R54
Movement Type    Automatic with manual winding
Precision   +25 to -15 seconds per day
Power reserve    Approx. 72 hours(3 days)
Jewels    24
Functions

• 24-hour hand (dual time display function)
• Stop seconds hand function

Сase/Band
Case Size
    Thickness:12.6mm
    Diameter:38.5mm
    Lug-to-lug:45.2mm
Crystal    Box shaped sapphire crystal
Crystal Coating    Anti-reflective coating on inner surface
LumiBrite   LumiBrite on hands, index(es) and bezel
Clasp   Three-fold clasp with push button release
Distance between lugs     19mm
Water Resistance    10 bar
Magnetic Resistance    4,800 A/m
Weight    131.0g
 Dial
Grey, satin dial

Features

• LIMITED EDITION on the case back
• Serial number engraved on the case back
• Rotating bezel (24-hour display)
• Screw-down crown
• Three-fold clasp with secure lock
• Screw case back

＊In the actual product, the case back direction might be different from that of the photograph.

🔰 Edition of ✅only to 4.000 pieces

🔴  Approximate recommended retail price in :  1.500 USD / EUR 1,400 €💰

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Press releases - 2023
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SEIKO WATCH CORPORATION
Mr­­ Noboru­­ Miyadera
2-8-10, Toranomon, Minato-ku,
Tokyo­­ 105-8467
Japan
Telephone+81 3 6739 2150
Telefax+81 3 6739 2071
seiko-pr@seiko-watch.co.jp
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www.SeikoWatches.com