Omega Seamaster 300 Co Axial Master Chronometer 41mmvsSeiko Prospex Sea 1965 Heritage Diver's Watch

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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.

Omega Seamaster 300 Co Axial Master Chronometer 41mm at true scale

Seamaster 300 Co Axial Master Chronometer 41mm

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

Prospex Sea 1965 Heritage Diver's Watch

Diameter

41mm

40mm

Lug-to-Lug

48mm

46.4mm

lowest

Thickness

13.8mm

13mm

lowest

Water Resistance

300m

300m

Power Reserve

60h

72h

highest

MSRP

$8,000

$1,300

lowest

Movement

Omega 8912

Seiko 6R55

Case

5 specs
Diameter
41mm
40mm
Thickness
13.85mm
13mm
Lug-to-Lug
48mm
46.4mm
Lug Width
21mm
20mm
Finish
Steel
n/a

Crystal & Dial

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

Movement

5 specs
Caliber
Omega 8912
Seiko 6R55
Power Reserve
60h
72h
Jewels
0
24
Hacking
Yes
No
Hand-winding
Yes
No

Pricing

1 specs
MSRP
$8,000
$1,300
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Reviews

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

Omega Seamaster 300 Co Axial Master Chronometer 41mm

Owners widely appreciate the Omega Seamaster 300 Co Axial Master Chronometer 41mm for its desirable throwback aesthetic and the comfort of its bracelet, including its clasp extension. Reviewers note the watch offers strong value with its METAS-certified Caliber 8912 movement and improved bezel. Some owners find the 41mm case wears larger than expected due to its thickness, and a few find the lollipop seconds hand visually heavy. Overall, owners and reviewers rate the Omega Seamaster 300 Co Axial Master Chronometer 41mm highly for its blend of vintage design and modern performance at its price point.

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.

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