Watches And Wonders 2025: Bremont Unveils The Groundbreaking Altitude Perpetual Calendar GMT

As the doors to Watches and Wonders 2025 opened in Geneva this April, British watchmaker Bremont made a bold statement with the unveiling of its most technically sophisticated timepiece to date – the Altitude Perpetual Calendar GMT Mono-pusher. Limited to just 50 pieces, this exceptional creation represents the pinnacle of Bremont's celebrated aviation-inspired Altitude Collection and signals the brand's continued ascension in the world of high-end watchmaking.

The Altitude Perpetual Calendar GMT Mono-pusher is the result of a prestigious collaboration between Bremont and two renowned Swiss specialists: movement manufacturer Sellita and complication specialist Agenhor, the celebrated Geneva atelier founded by horological visionary Jean-Marc Wiederrecht and now led by his sons, Laurent and Nicolas. Bremont CEO Davide Cerrato explained the ambitious vision behind the watch: "The combination of a perpetual calendar and GMT function is extremely rare in watchmaking, but for Bremont it gives us the perfect mix of classical sophistication and adventurousness. We love the idea that it's quite unusual but also really useful."

What sets this timepiece apart is Bremont's insistence that such sophisticated complications maintain the rugged, practical DNA that has defined the brand since its founding in 2002. "It had to be as robust as any of the Altitude watches, easy to use, and present a durable, sporty execution of a Perpetual Calendar GMT – it's intended as an everyday watch, not a delicate item that lives in the safe," Cerrato emphasized.

At the heart of this exceptional timepiece is a manually-wound base calibre from Sellita, the AMT6900, part of Sellita's top-tier, custom-build AMT (Atelier Manufacture Technique) program. Exclusively for Bremont, Agenhor has devised a slim and highly economical module integrating both the perpetual calendar and GMT functions.

The movement's baseplate and bridges display a 'soleillage courbe' (curved sunray) finish, complemented by polished screw-heads and wheels that combine snailed and polished finishing. Despite its complexity, the entire mechanism – combining both the base movement and complication module – stands at just 6.8mm thick, resulting in a highly wearable 12.65mm case depth.
Practicality was paramount in the design process. The GMT function is adjusted via an innovative mono-pusher integrated into the crown, allowing the wearer to advance the second time-zone indication in one-hour increments. Recessed correctors at 2 and 4 o'clock enable straightforward adjustments of the calendar functions while maintaining the case's streamlined profile.
Bremont's design team faced the considerable challenge of integrating two complex complications – a perpetual calendar and a GMT – without sacrificing the Altitude Collection's aviation-inspired sportiness, everyday usability, and visual clarity. Their solution is an ingeniously efficient display system. For the GMT, a domed disc at 12 o'clock features a globe decoration that provides the second time-zone indication. As the globe turns, an arrow indicates the home time against a 24-hour index divided into day and night sections.

The perpetual calendar's indications are distributed across two other subdials. At 6 o'clock, a pointer indicates the date on a circumferential index. At 3 o'clock, 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 representing years in the leap cycle, with the first sector including markings for the 12 months.

The red-tipped blade denotes the current position in the four-year leap cycle, while the month is shown by whichever blade passes through the first sector. This propeller's movement is nearly imperceptible, advancing in 172 micro-jumps across the four-year cycle – a shift of just under 2.1 degrees every eight days. Completing the aviation-themed display, running seconds are shown at 9 o'clock with a two-blade 'propeller' hand on a sector-style subdial featuring Bremont's Wayfinder logo at its center.

Visually, the watch honors Bremont's aviation heritage with its 'Air Force Blue' dial and case barrel – a richly nuanced shade long associated with aviation and inspired by the blue-grey uniforms of Britain's Royal Air Force. The vertically brushed dial finish, reminiscent of mid-Century vintage watches, provides a sophisticated contrast with the black tonality of the chapter ring and date sub-dial. The 42mm case is crafted from lightweight grade 2 titanium and features Bremont's signature three-piece Trip-Tick construction. The blue PVD-coated center barrel stands out distinctively against the titanium top and bottom sections, creating a visual harmony that echoes the dial's aesthetics.

At Watches and Wonders 2025, the Altitude Perpetual Calendar GMT Mono-pusher stands as a testament to Bremont's evolution from a maker of robust tool watches to a serious player in the high complications arena. Positioned alongside offerings from established Swiss maisons, Bremont's latest creation has drawn particular attention for combining sophisticated complications with genuine everyday wearability – a philosophy that has always distinguished the British brand's approach. With its £33,500 price tag, the Altitude Perpetual Calendar GMT delivers exceptional value in the realm of high complications while offering rarity, ingenuity, and masterful craftsmanship. Limited to just 50 pieces, it represents a significant milestone in Bremont's journey and a bold statement of British watchmaking prowess on the global stage.