Seiko Prospex Sea 1965 Heritage Diver's WatchvsYema Superman Steel CMM.10
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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.

Prospex Sea 1965 Heritage Diver's Watch

Superman Steel CMM.10
Diameter
40mm
39mm
Lug-to-Lug
46.4mm
n/a
Thickness
13mm
11.3mm
lowest
Water Resistance
300m
300m
Power Reserve
72h
n/a
MSRP
$1,300
lowest
$1,890
Movement
Seiko 6R55
Yema CMM.10
Case
5 specsCrystal & Dial
5 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Seiko Prospex Sea 1965 Heritage Diver's Watch for its refined engineering, comfortable 40mm case, and improved 300m water resistance. The watch is noted for its better build quality and finishing compared to some alternatives, featuring a mix of polished and brushed surfaces, with specific callouts for the jewel-toned teal dial with a rippling-water pattern. Some owners consider the price fair, while others suggest it is too high. Accuracy figures vary, with some owners reporting their 6R55 movement performs well within +/- 10 seconds per day, while others note theirs runs slow or have concerns about QC for the price. The bracelet, while improved, lacks modern features like quick-release or extensive micro-adjustments. Overall, owners and reviewers rate the Seiko Prospex Sea 1965 Heritage Diver's Watch highly for its refined design and build quality at its price point.
Owners widely praise the Yema Superman Steel CMM.10 for its refined casework, including polished lug bevels and an elegant crown guard, and its comfortable 39mm size. The glossy black dial and bezel insert provide depth, and the in-house CMM.10 movement is noted for accuracy, with one owner reporting losing only 2 seconds in 2 days. The scales bracelet is described as gorgeous and comfortable, though some find its polished center links too flashy. One reviewer flagged the bezel lock mechanism as flimsy and inconvenient, and another noted a strap's shape made it less comfortable on smaller wrists. The Yema Superman Steel CMM.10 features Grade A Super-LumiNova and the CMM.10 automatic movement with a 70-hour power reserve, regulated to +5/-3 seconds per day. Overall, owners and reviewers rate the Yema Superman Steel CMM.10 highly for its refined finishing and comfortable wearability at its price point.
The Yema Steel features an in-house movement with a micro-rotor, one of the most beautiful at this price point. The watch's clasp feels a bit thin, which is a notable drawback. Reviewers disagree on the movement's power reserve, with one reviewer noting a 42-hour reserve and the other not mentioning power reserve at all.
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