Skin Diver Slim Full Lume CMM.20 - Ltd Ed 400pcs

We all are familiar with countless exceptional watches made by the Swiss and Japanese that are dominating the market. Nonetheless, the French also displayed excellence in the fine art of watchmaking with the creation of many beautifully decorated haute horlogerie pieces and complex movements. While YEMA may not be a name that the masses are entirely familiar with, it is a brand synonymous with the production of fine French-made timepieces and an incredibly rich heritage.

Founded in 1948 by Henry Louis Belmont—a product of the National Watchmaking School of Besançon who clearly knew his way around a caliber—YEMA has spent the better part of eight decades cementing its status as the backbone of French tool watches. They have carved out a niche by obsessively refining their most emblematic designs, covering everything from the cockpits of fighter jets to the crushing depths of the ocean. Their revival of the Superman, often cited as the definitive French dive watch, proved that the brand understands the weight of its own heritage. Following the 2025 success of the Skin Diver Slim, the brand is showing no signs of slowing down; serving as the third installment of their ambitious five-act performance at Geneva Watch Week, we are introduced to the Skin Diver Slim Full Lume CMM.20 Limited Edition.

Right off the bat, the stainless steel case of this Skin Diver leans heavily into the 1960s aesthetic, hitting all those sweet spots that make vintage enthusiasts nod in approval. It retains every essential code of the classic skin diver silhouette: perfectly balanced proportions, elegant 20 mm curved lugs, that unapologetic unguarded screw-down crown, and a profile slim enough to disappear under a cuff. YEMA clearly knows the secret recipe for crafting an enthusiast-driven, vintage-inspired mechanical piece that avoids the pitfalls of being too chunky or over-engineered. With a case diameter of 39mm, a lug-to-lug distance of 47mm and an incredible thickness of 9.90mm (exclude sapphire crystal), you can expect the watch to look incredibly sturdy yet thin on the wrist, exhibiting a sporty yet elegant appeal.

Drawing inspiration from YEMA's iconic 1960s archives, the case architecture exudes a profound vintage charm and distinct retro flair. Signature elements, such as the classic unguarded crown and remarkably slim profile, stay true to its heritage, while the expert vertical brushing and polished bevels enhance its nostalgic character. To complete the aesthetic, the black unidirectional sapphire bezel is tinted in perfect harmony with the white dial, mirroring the brushed finish of the case to create a seamless and cohesive silhouette.

Underneath that double domed sapphire crystal lies a dial that takes the vintage skin diver blueprint and gives it a radical, high contrast twist. The base features a clean matte white finish that acts as a stark canvas for the black outlined indices and hands, creating a level of clinical legibility that feels right at home in a professional instrument. As a true collector edition, the dial is essentially conceived as a light source in its own right, thanks to a full lume surface that makes readability instantaneous regardless of the ambient conditions. Even with a dense and complex layout, the watch remains intuitive to read at a glance, utilizing those classic triangular indices paired with bold Arabic numerals at the 3, 6, 9, and 12 o'clock positions. The handset is equally deliberate, featuring an oversized arrow minute hand, a long pencil hour hand, and a quirky lollipop seconds hand. Every element is generously filled with green tinted Super LumiNova and framed in polished steel, ensuring that this watch is not just a handsome nod to the sixties, but a functional tool that stays perfectly visible no matter how dark the water gets.

Not stopping there, the true ingenuity that allows for such a slim and high functioning watch is the state-of-the-art micro-rotor caliber that represents a significant evolution from the brand's previous reliance on Sellita/ETA movements or the YEMA2000 caliber. The CMM.20, developed with input from the renowned Olivier Mory and Patrick Augerau, is a testament to French horological craftsmanship, with its components produced either by YEMA in Morteau, France, or by local suppliers within a 72km radius. This movement features a tungsten micro-rotor on ball bearings, achieving a thinner profile which contributes to the watch's overall slimmed-down case design without compromising its dive watch capabilities. Peering through the sapphire exhibition case back, you get a clear look at the technical refinement that makes this thin profile possible, offering a mechanical view that is every bit as impressive as the dial-side aesthetics.

A micro-rotor has to be fine-tuned and carefully crafted taking it's shape and aerodynamics into consideration in order for it to capture kinetic energy to power the watch. My minimising the space taken, the rotor is allowed to be moved back, remove a whole entire layer of the movement which makes it possible for a watch to be this slim. It cannot be said enough the ingenuity and the technology powering this horology piece. All of which is featured on an exhibition case back for full view, allowing for 300m of water resistance.

Developed specifically for this edition, the white FKM rubber strap extends the full-lume concept beyond the dial and onto the wrist for a look that is as cohesive as it is bold. The material itself is incredibly flexible and resilient, ensuring it stays comfortable even in the most demanding conditions, all while giving the watch a distinctly exclusive and contemporary edge that feels perfectly aligned with its diving roots. A brushed stainless steel buckle completes the package, mirroring the restrained, functional elegance of the case and ensuring that the entire ensemble remains as practical as it is striking.

Limited to just 400 pieces, this release hits the mark by keeping everything that made the original Skin Diver a classic while refusing to just rest on its laurels. As the third installment in their Geneva Watch Week series, it is a genuine surprise that goes well beyond the typical vintage reissue. If you want a watch that sits perfectly on the wrist and lights up like a torch the moment the sun goes down, this is about as cool as it gets. It is functional, it is legitimately different, and it shows that YEMA is moving in a direction that actually keeps you guessing.

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