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.

Seiko Prospex Sea 1965 Heritage Diver's Watch at true scale

Prospex Sea 1965 Heritage Diver's Watch

Yema Superman Steel CMM.10 at true scale

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 specs
Diameter
40mm
39mm
Thickness
13mm
11.3mm
Lug-to-Lug
46.4mm
n/a
Lug Width
20mm
19mm
Material
Stainless Steel
316L Stainless Steel

Crystal & Dial

5 specs
Crystal
Sapphire
Domed Sapphire
Crystal Shape
Curved
n/a
AR Coating
Anti-reflective coating on inner surface
n/a
Dial Color
n/a
Steel
Lume
LumiBrite on hands, index(es) and bezel
None

Movement

3 specs
Caliber
Seiko 6R55
Yema CMM.10
Power Reserve
72h
0h
Jewels
24
0

Pricing

1 specs
MSRP
$1,300
$1,890
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seiko Prospex Sea 1965 Heritage Diver's Watch

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.

Yema Superman Steel CMM.10

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.

From video reviewers

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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