Oak & Oscar The Humboldt Seven YearvsYema Skin Diver Slim CMM.20
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

The Humboldt Seven Year

Skin Diver Slim CMM.20
Diameter
39.5mm
47mm
Lug-to-Lug
46.8mm
n/a
Thickness
12.4mm
10mm
lowest
Water Resistance
200m
200m
Power Reserve
42h
n/a
MSRP
$2,500
$2,117
lowest
Movement
Sellita SW300-1
Yema CMM.20
Case
5 specsCrystal & Dial
5 specsMovement
5 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Oak & Oscar The Humboldt Seven Year owners widely praise its design, craftsmanship, and unique details like the navy blue sandwich dial and 12-hour bezel. Some owners find its quality comparable to Sinn watches and appreciate its wearability, with one calling it their most worn watch. Accuracy is reported to range from approximately 1 second per day to -5 seconds per day, and the Sellita SW300 movement is noted. One owner flagged minor imperfections on the dial and crystal, and another found the bracelet's half-link created an odd angle. Overall, owners rate Oak & Oscar The Humboldt Seven Year highly for its exceptional attention to detail in design and customer experience.
Owners widely praise the Yema Skin Diver Slim CMM.20 for its vintage charm, applied indices, and unique champagne dial, with many appreciating its balanced 39mm case size. Some reviewers and owners note finishing inconsistencies, particularly on a prototype's hour hand, and a stamped clasp quality considered subpar, with one owner disliking a perceived gap. The Yema Skin Diver Slim CMM.20's micro-rotor movement has drawn some scrutiny, with potential QC issues like erratic timegrapher readings and second-hand stutter reported by a few owners, and the lack of hacking seconds is flagged as a drawback at its price point. On balance, owners and reviewers appreciate the Yema Skin Diver Slim CMM.20 for its strong vintage aesthetic and well-proportioned case, despite some noted concerns regarding movement behavior and clasp quality.
The slim 39mm case delivers vintage dive watch proportions with exceptional wearability, and the in-house CMM.20 micro-rotor movement distinguishes it from larger competitors at a compelling price point. The full-lume dial and glowing rubber strap create striking visibility that sets it apart in the slim dive watch category.
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