Scurfa Diver One D1-500vsYema Superman 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.

Diver One D1-500

Superman Slim CMM.20
Diameter
40mm
39mm
Lug-to-Lug
47.7mm
n/a
Thickness
14.4mm
9.9mm
lowest
Water Resistance
500m
highest
300m
MSRP
$237
lowest
$2,372
Movement
Ronda 715
Yema CMM.20
Case
5 specsCrystal & Dial
2 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Scurfa Diver One D1-500 for its robust 40mm case, described as ideal for everyday wear and resembling an older Submariner. Reviewers and owners alike highlight its excellent legibility and a scratch-resistant, moderately domed sapphire crystal with strong anti-reflective properties. The Ronda 715 quartz movement is noted as a practical choice for diving. Some owners find the titanium case's warmth and lightness a significant advantage, and the lume is frequently lauded as exceptionally bright, though one reviewer noted it is not as impressive as on pricier models. The aluminum bezel offers a distinct aesthetic. Water resistance is 500m. Opinions on the logo are split, with one owner expressing a preference against it. Overall, owners and reviewers rate the Scurfa Diver One D1-500 highly for its tool-like build quality and legibility at its price point.
Owners widely praise the Yema Superman Slim CMM.20's appealing retro design, 39mm case, and the in-house CMM.20 micro-rotor movement, with some specifically noting the fish scale bracelet. Reviewers and owners alike mention the movement's design can lead to a "jittery" seconds hand, though Yema states this does not impact performance. Some owners question the $2500 MSRP, finding it overpriced, while others note initial stiffness in the bracelet that improves with wear. Finishing inconsistencies were noted on a prototype, and the stamped clasp on the bracelet is considered subpar by one reviewer. Overall, owners and reviewers find the Yema Superman Slim CMM.20 a compelling option for its vintage styling and unique micro-rotor movement, despite some concerns about its value proposition and minor execution details.
The upgraded CMM.20 micro-rotor movement is a significant enhancement. Reviewers noted the slim profile and redesigned case. One reviewer indicated a significant flaw was discussed, but the nature of this imperfection was not specified.
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