BREMONT – TALTITUDE Skeletonised Perpetual Calendar GMT Mono-pusher 42mm Titanium Edition 2025
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Go behind the dial to uncover why this is not your average perpetual calendar timepiece.
Bremont is proud to unveil a skeletonised edition of the Altitude Perpetual Calendar GMT Mono-pusher celebrating the beauty and ingenuity of the exclusively designed Agenhor movement within.
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First introduced at Watches & Wonders 2025, the model unites two legendary complications in one supremely robust, perfectly engineered timepiece. Crafted from lightweight grade 2 titanium and featuring the Altitude collection’s signature three-piece Trip-Tick case construction, the model is built for those who demand refinement, resilience and practicality.
Perpetual performance
The Altitude Perpetual Calendar seamlessly integrates a GMT function without compromising the Altitude Collection’s aviation-inspired sportiness, everyday usability, and visual clarity. The openworked dial displays complex information with exceptional legibility, while decorative arms in Air Force Blue lend structural support to the subdials — preserving both the durability and distinctive design language of the Altitude range.
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At 12 o’clock, a domed globe disc – echoing that previously seen in 2024’s Terra Nova Dual-Time Tourbillon – provides the second time-zone indication: as the globe turns, an arrow indicates the home time against a 24-hour index that’s divided into day and night sections.
Adjusting this is straightforward: a mono-pusher integrated into the crown allows the wearer to advance the arrow in one-hour increments. A corrector at 2 o’clock allows you to set the date, whilst a corrector positioned at 4 o’clock allows you to set the leap year and month.
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At 9 o’clock, running seconds is displayed with a lume-tipped two-blade ‘propeller’ hand, on a sector-style subdial. The perpetual calendar’s indications – date, month and position in the leap year cycle – are presented on the other two subdials, at 3 o’clock and 6 o’clock respectively. At 6 o’clock, a pointer indicates the date on a radial index.
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At the 3 o’clock position, a beautifully intuitive month/year indication uses a four-blade propeller-style hand, with three white-tipped blades and one red-tipped blade. The subdial is divided into four sectors, each representing a year in the leap cycle, while the first sector also includes markings for the 12 months.
The red-tipped blade denotes the current position in the four-year cycle, while the month is shown by whichever of the four blades is passing through the first sector at any given time. The propeller’s movement is imperceptible, advancing in 172 micro-jumps across the four-year cycle – a shift of just under 2.1 degrees every eight day.
Skeletonised elegance
Bremont’s first Perpetual Calendar GMT Mono-pusher demanded the best in Swiss engineering and British craft. The complication module was created exclusively for Bremont by Agenhor in Geneva, masters of ingenious mechanics.
Founded in 1996 by horological visionary Jean-Marc Wiederrecht, Agenhor has earned numerous accolades for its groundbreaking innovations, featured in timepieces from esteemed brands including MB&F, H. Moser & Cie, and Hermès.
The Perpetual Calendar GMT Monopusher complication truly showcases Agenhor’s mastery and through stripping back the solid dial of the original Perpetual model, the skeletonised edition showcases the original architecture and elegant simplicity of the module.
Click, to see the large size. ▶ BIG FOTO 
The base calibre is a manually wound movement - the AMT6900, produced within Sellita’s top-tier, custom-build AMT (Atelier Manufacture Technique) programme. The combined movement measures just 6.8mm — keeping the case a lean 12.65mm.
Click, to see the large size. ▶ BIG FOTO 
The Altitude Skeletonised Perpetual Calendar GMT takes the complexity of this watch and makes it tangible, visible, and captivating. It allows collectors to see the interplay between the GMT and perpetual calendar complications, while retaining all the robustness, usability, and distinctive character of the Altitude Collection.” - Davide Cerrato, Bremont CEO.
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With its open-worked architecture, highly engineered complications, and aviation-inspired design codes, the Skeletonised Altitude Perpetual Calendar GMT Mono-pusher stands as a pinnacle of Bremont’s watchmaking, appealing to enthusiasts who value both mechanical mastery and contemporary visual impact.
Limited to 50 pieces, it offers a rare combination of durability and high-horology, representing a significant step in Bremont’s technical capability.
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TECHNICAL SPECIFICATIONS
Collection: ALTITUDE
Model: Bremont ALTITUDE Skeletonised Perpetual Calendar GMT Monopusher
Reference: ALT42-PER-TI-BLSKL-B
Reference: ALT42-PER-TI-BLSKL-H
CASE
Material: Titanium, satin and polished
Diameter: 42 mm
Thickness: 12.65 mm
Lug-to-lug: 49.62 mm
Glass Box anti-reflective sapphire crystal
Push-in mono-pusher crown
Month & year correctors to 2 and 4 o’clock
Decorated titanium open case back
Water-resistant to 100 meters
DIAL & HANDS
Brushed Blue Galvanic metal skeleton dial including applied Numerals and Indexes filled with white Super-LumiNova® (Blue emission).
GMT Globe with Day and Night 24 hour sub-dial ring at 12 O'clock.
Blue Satin and CD lines on Sub-dial at 9 and 3 O'clock.
CD Lines and Black Sub-dial ring on Sub-dial at 6 O'clock.
MOVEMENT
Caliber BHC9192-MH
Mechanical hand-wound movement
Number of jewels: 19
Glucydur balance wheel
-6 /+6 seconds accuracy
Power reserve of 50 hours
FUNCTIONS
Hours, minutes
Small seconds at 9 o’clock
24hr GMT Globe at 12 o’clock
Date at 6 o’clock
Month/Leap year sub-hand at 3 o’clock
STRAP
Quick release titanium bracelet & Quick-release blue patina leather strap
Lug width: 22 mm
Click, to see the large size. ▶ BIG FOTO 
Includes limited edition wooden box, internal document holder, and coin designed corrector tool.
MADE IN ENGLAND 🇬🇧 3 YEARS OF WARRANTY
🔰Edition - Only ✅ 50 pieces
🔴Retail price: US $ 42,500.00 / EUR 44'400 / £ 37,000.00 without taxes💰
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#BremonPerpetualCalendar #SkeletonisedPerpetualCalendar
#BremontTitanium #AltitudePerpetualCalendarGMT
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Press release - 2025
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For further press information,
images or to arrange interviews please contact Natalie Keigher
Email: natalie@bremont.com email info@bremont.com
∙ Telephone +44 0845 0940 690
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