I’ve always admired Yema as a brand, especially for its strong heritage and focus on tool watches. However, this is the first time I’ve actually had the chance to spend real time with one on the wrist.

Even though this piece was provided on loan, it turned out to be a genuinely great experience. It gave me the opportunity to understand the watch beyond specs and photos, how it feels, how it wears, and how much character it develops in everyday use.

And even though Yema is a well-known brand, it’s worth starting with a brief look at its history.

Brief history of Yema watches

Yema is an independent French watchmaker based in Morteau, widely considered the heart of traditional French watchmaking. Founded in 1948 by Henry-Louis Belmont, the brand was built around a clear idea from the beginning: creating robust, purpose-driven tool watches for demanding environments.

In its early decades, Yema quickly established itself as a pioneer in waterproof and automatic watches in France. By the 1950s and 60s, the brand was producing tens of thousands of watches and expanding internationally, with a strong focus on diving, aviation, and motorsport instruments. This era also gave birth to some of its most important designs, including the iconic Yema Superman, known for its distinctive bezel-lock system and strong professional diving credentials.

Yema’s history is closely tied to exploration and performance. Its watches have been used by naval units, aviation rescue teams, and even space missions(in 1982 the the YEMA Spationaute I. worn by Jean-Loup Chrétien), reinforcing its identity as a true tool watch manufacturer rather than a fashion-oriented brand. Over the decades, the company went through several ownership changes, including periods under international groups, before eventually returning to French control.

In recent years, Yema has undergone a significant transformation, shifting its focus back to in-house development and local manufacturing in Morteau. This includes the creation of its own Manufacture calibers, such as the modern CMM series, marking an important step toward technical independence and stronger vertical integration.

Today, Yema is still family-led and continues to build on its heritage of functional, capable watches—now paired with modern engineering and in-house movement production.

Much of the brand’s detailed history is well documented on their official website for those who want to dive even deeper.

Unboxing

Yema keeps things classic right from the start. The watch arrives in an elegant wooden presentation box, finished with the Yema logo on the front. It feels solid, refined, premium and in line with the brand’s heritage-driven approach.

Inside, you’ll find the watch accompanied by a personalised International Warranty card, matching the limited edition numbering. It’s a small touch, but one that reinforces the exclusivity of the piece.

Overall, it’s a simple yet premium unboxing experience. Nothing over the top, just well executed and fitting for a limited edition diver.

The dial

The watch is available in green or grey (this grey version being limited to just 200 pieces) the dial is where Yema really leans into bold, functional design.

The layout is all about legibility. Oversized applied triangular hour markers are paired with Arabic numerals, and they stretch toward the centre of the dial, giving it a full, balanced look despite the compact 39mm case.

The sandblasted enamel dial has a matte finish that adds a subtle texture, while the gilt-finished markers and hands bring warmth and contrast against the dark surface. Everything is filled with Grade A Super-LumiNova, ensuring strong visibility in low light.

It’s a dial that feels purposeful and easy to read, but still carries enough character to keep things interesting.

It is covered with the 2.20 mm double-domed sapphire crystal, which adds another layer of charm. It creates a subtle distortion at certain angles, which not only enhances the vintage feel but also makes it especially fun to photograph. The watch is highly legible in almost every circumstance but I would appreciate a bit stronger AR coating to avoid certain reflections.

The movement

Inside beats Yema’s in-house micro-rotor calibre, the Calibre Manufacture Morteau (CMM.20), and this is where the watch really elevates itself. Visible through the sapphire caseback, it’s a pleasure to look at, especially thanks to the distinctive micro-rotor design.

This architecture allows the movement to stay ultra-thin, which directly contributes to the watch’s slim 10mm profile. Thats something you don’t often see in a 300m diver. It’s a smart bit of engineering that blends performance with wearability.

On paper, it delivers -3/+7 seconds per day accuracy along with a strong 70-hour power reserve, making it both precise and practical for everyday use.

It’s a rare combination: a proper dive watch with an in-house, micro-rotor movement that’s not just functional, but also worth showcasing.

The case, the strap and wearability

The Skin Diver Slim Bronze stays true to its name. At 39mm with a lug-to-lug of 47mm and just 10mm thickness, it wears incredibly well on the wrist—compact, balanced, and easy to pair with almost anything.

The bronze case is a standout feature. Warm and tactile, it will develop a unique patina over time, meaning each watch slowly takes on its own character. The brushed surfaces combined with polished bevels add just enough refinement without losing that tool-watch feel. I have to note that as my watch was a loan, it already started to develop some sort of patina.

The screw-down crown, engraved with Yema’s logo, is also worth mentioning—it feels solid and is a real pleasure to operate, adding to the overall sense of quality and usability.

The curved lugs help the watch sit nicely on the wrist, while the unguarded crown keeps the vintage aesthetic intact. Despite its slim profile, it still delivers a solid 300m water resistance, making it a true dive watch at heart.

Overall, it’s one of those pieces that feels effortless to wear—equally at home with casual outfits or something a bit more dressed up.

The watch comes fitted with an FKM VITON® rubber strap, finished with a brushed bronze buckle to match the case.

The strap features a subtle honeycomb pattern that runs along its length, adding a bit of texture without being too loud. Colour-matched to the dial, it ties the whole look together nicely.

It’s a practical choice as it’s durable, comfortable, and perfectly suited for a dive watch but it also plays an important role visually, balancing the warmth of the bronze with a more modern, understated feel.

On my 17cm wrist, I do have to wear it on the last hole, so the strap runs a bit long for my sizing, but it’s still comfortable once adjusted. If you have a smaller wrist, it might be uncomfortable though. But you can always just change to another strap.

Final thoughts

The Skin Diver Slim Bronze CMM.20 Limited Edition is one of those watches that quietly does a lot right.

It combines vintage design with modern execution in a way that feels natural, not forced. The slim profile, solid specs, and that in-house micro-rotor movement really elevate the whole package, helping it stand out in a crowded dive watch space. It’s also a joy to interact with the micro-rotor movement itself feels like a small engineering treat every time you engage with the watch and operate the crown.

What really makes it special, though, is how easy it is to wear. It’s a true tool watch with 300m water resistance, yet it slips under a cuff and works just as well in everyday settings. Add the bronze case that will develop its own unique patina over time, and you get a piece that evolves with you.

It’s a very compelling offering, especially as a limited run of just 200 pieces.

A modern skin diver done right. Highly recommended!

Specifications

• Material: Bronze
• Size: 39mm with 10mm thickness
• Lug width: 20mm
• Crystal: 2.2mm doomed sapphire
• Bezel: Unidirectional diving bezel with sapphire insert and “ghost” markers (0 to 60 graduation)
• Movement: CMM20 micro rotor
• Power reserve: 70 hours
• Water resistance: 300m
• Strap: Rubber FKM VITON® Scales strap with bronze buckle
• Price: 2249 euro

Link:

Skin Diver Slim Bronze CMM.20 Limited Edition