Published matchup
The Humboldt Seven Year vs Naos Pro Automatik vs C65 Sandhurst Series 2 vs 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

Naos Pro Automatik

C65 Sandhurst Series 2

Skin Diver Slim CMM.20
Diameter
39.5mm
38mm
38mm
47mm
Lug-to-Lug
46.8mm
42.4mm
43.7mm
n/a
Thickness
12.4mm
9mm
lowest
11.9mm
10mm
Water Resistance
200m
50m
150m
200m
Power Reserve
42h
42h
38h
n/a
MSRP
$2,500
$699
lowest
$1,375
$2,117
Movement
Sellita SW300-1
Miyota 9015
Sellita SW200-1
Yema CMM.20
Case
7 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.
The Sternglas Naos Pro Automatik is praised for its slim, wearable 38mm case with a mix of brushed and polished finishes and a refined Bauhaus dial design. Reviewers note the upgraded Miyota 9015 movement and improved wearability. Some find the optional five-link bracelet too chunky and lacking refinement, with one reviewer noting its accuracy of -10/+30 seconds per day is not for precision enthusiasts. On balance, reviewers rate the Sternglas Naos Pro Automatik highly for its slim case and refined dial design at its price point.
The Bauhaus design is a strength. The value proposition is a weakness.
Owners widely praise the Christopher Ward C65 Sandhurst Series 2 for its balanced wearability, clean British-military aesthetic, and COSC-certified accuracy. The 38mm case size aligns with a trend for smaller watches, and its mid-century design is described as ultra-legible and cool, with a gorgeous domed crystal and a MOD badge on the caseback adding charm for military enthusiasts. Some owners question its claimed military heritage compared to other brands, and a few find the 38mm size potentially too small for larger wrists. The watch features a Sellita SW200 COSC chronometer movement with Grade X1 Super-LumiNova. On balance, owners rate the Christopher Ward C65 Sandhurst Series 2 highly for its character, perfect dimensions, and COSC-certified accuracy.
The COSC-certified movement and vintage military aesthetic are praised. The sub-£1,000 price point is considered remarkable for the quality.
Owners and reviewers widely praise the Yema Skin Diver Slim CMM.20 for its balanced 39mm case, vintage aesthetic, and unique champagne dial. The proprietary CMM.20 micro-rotor movement is a notable feature, though some owners report potential QC issues including erratic timegrapher readings and second-hand stutter. The lume is described as subdued, and while some find the "dragon scale" bracelet beautiful, others consider it generic. The price point is a hurdle for some, and the stamped clasp quality is considered subpar by one reviewer, with a gap noted by an owner. The lack of hacking seconds is flagged as a drawback at its price. Overall, owners and reviewers rate the Yema Skin Diver Slim CMM.20 highly for its vintage charm and balanced wearability.
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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