Elliot Brown OSO Limited EditionvsYema 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.

OSO Limited Edition

Superman Slim CMM.20
Diameter
43mm
39mm
Thickness
11.4mm
9.9mm
lowest
Water Resistance
200m
300m
highest
MSRP
$576
lowest
$2,372
Movement
Ronda 715
Yema CMM.20
Case
6 specsCrystal & Dial
2 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners praise the Elliot Brown OSO Limited Edition's "bad ass" blackout aesthetic. One owner expresses concern regarding the crystal and legibility. Reviewers find the Beachmaster line, including the OSO Limited Edition's siblings, to be exceptionally well-built tool watches that feel rugged and durable, though some find the crowns slightly undersized for convenient bezel adjustment and time setting. On balance, owners and reviewers value the Elliot Brown OSO Limited Edition for its rugged build and distinctive blackout look.
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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