Omega Seamaster 300vsYema Skin Diver 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.

Seamaster 300

Skin Diver CMM.20
Diameter
39mm
39.5mm
Lug-to-Lug
n/a
47mm
Thickness
n/a
11.5mm
Water Resistance
200m
200m
MSRP
n/a
$2,372
Movement
Omega 552
Yema CMM.20
Case
6 specsCrystal & Dial
1 specsMovement
1 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Omega Seamaster 300 for its pure design, featuring a sandwich dial and Broad Arrow hour hand, with many calling it their most worn watch and an incredible value. Reviewers note its improved and modernized aesthetic compared to previous models, highlighting its curvaceous look, pronounced sapphire crystal, and scratch-resistant bezel insert. Some owners find the standard color schemes the best value, while others appreciate the timeless appeal of specific dial colors or unique finishes. One owner reports the coaxial 8800 movement runs at approximately 1.2 seconds fast per day per Omega's specifications, though subjectively closer to 0.2 seconds fast. The bracelet's minimal taper and end link design are noted points of contention by one reviewer. On balance, owners and reviewers rate the Omega Seamaster 300 highly for its attractive pure design and exceptional value.
The Yema Skin Diver CMM.20 is lauded for its vintage aesthetic, 39.5mm case size, and well-proportioned handset with sharp indices. Owners praise its textured cream dial, French tool watch elegance, and the smooth winding feel of the in-house CMM.20 micro-rotor movement. The fully brushed bracelet with toolless micro-adjust clasp is considered Yema's best yet. Accuracy readings range from -3/+7 seconds per day to approximately 0 to -10 seconds per day. Some reviewers noted questionable finishing on a prototype's hour hand and a rattly, stamped clasp. The watch's pricing has been questioned by some due to brand QC reputation, and its extended lug-to-lug may challenge smaller wrists. On balance, owners and reviewers appreciate the Yema Skin Diver CMM.20 for its vintage styling and improved bracelet design at its price point.
The sapphire bezel insert and in-house CMM.20 movement are noted strengths. Reviewers questioned the value proposition compared to other Yema models.
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