With the introduction of the Overseas Self-Winding Ultra-Thin, Vacheron Constantin presents a new manufacture movement that advances its long-standing expertise in ultra-thin watchmaking.
Developed over seven years, the new Calibre 2550 combines a thickness of just 2.4 mm with an extended power reserve of approximately 80 hours, introducing a reworked architecture aimed at improving both efficiency and reliability within a reduced volume.
The movement measures 30.6 mm in diameter and is composed of 153 components and 25 jewels, operating at a frequency of 3 Hz (21,600 vibrations per hour).
At the core of the new movement is a combination of three main elements: a bidirectional micro-rotor, a suspended double barrel and a compact single-level gear train.
The micro-rotor, crafted from 950 platinum and measuring 15.5 mm in diameter, is integrated directly into the mainplate, reducing overall thickness while maintaining efficient winding thanks to the density of the material.
The double barrel system plays a central role in achieving the 80-hour power reserve. The two barrels are arranged in a superimposed configuration, pivoting on a single post and operating in series despite their stacked layout.
This arrangement allows for a more stable delivery of torque, contributing to consistent timekeeping. By eliminating certain components, including one barrel cover and the ratchet, the design also supports the movement’s slim profile.
The gear train has been entirely reconsidered to fit within a single level. Comprising five wheels, two of which are mounted on ball bearings, this layout enhances efficiency while contributing to the overall robustness of the movement.
The movement is finished according to traditional high-end watchmaking standards. The mainplate features circular graining, while the bridges are bevelled and decorated with Geneva stripes.
The upper barrel drum is snailed, and the wheels are sunburst-finished. The micro-rotor combines circular satin finishing on its periphery with a grained centre and a polished motif inspired by a compass rose.
Calibre 2550 makes its debut in a new Overseas Self-Winding Ultra-Thin reference, housed in a 39.5 mm case with a thickness of 7.35 mm. This makes it the thinnest model in the collection since it was entirely redesigned in 2016.
For the first time in the Overseas line, the case, bracelet and clasp are crafted entirely from 950 platinum.
The alloy used incorporates copper and gallium and undergoes a thermal hardening treatment, resulting in increased resistance to scratches and shocks compared to standard platinum alloys.
The watch is water-resistant to 5 bar (approximately 50 metres / 165 feet) and showcases its innovative movement through a sapphire crystal caseback.
The dial adopts a sunburst satin-finished salmon lacquer, complemented by a velvet-finished outer minute track. Applied hour markers and hands in 18K white gold are treated with blue Super-LumiNova for legibility in low-light conditions.
The display is limited to hours and minutes, in line with the restrained approach typical of ultra-thin watches.
The watch is delivered on an integrated 950 platinum bracelet with alternating polished and satin-brushed links, secured by a triple-blade folding clasp in 18K white gold with a comfort adjustment system.
Two additional interchangeable straps—a beige rubber strap and a dark beige alligator strap with a nubuck finish—are included, both fitted with a platinum pin buckle.
Certified with the Hallmark of Geneva, the Vacheron Constantin Overseas Self-Winding Ultra-Thin, ref. 2500V / 210P–H028, is produced in a limited edition of 255 individually numbered pieces and is available exclusively through Vacheron Constantin boutiques. The price is available on request. vacheron-constantin.com
DISCOVER MORE WATCHES & WONDERS 2026 NOVELTIES
COMMENTS