Duckworth Prestex Belmont 300 AutomaticvsSeiko 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.

Belmont 300 Automatic

Prospex Sea 1965 Heritage Diver's Watch
Diameter
42mm
40mm
Lug-to-Lug
50mm
46.4mm
lowest
Thickness
13mm
13mm
Water Resistance
300m
300m
Power Reserve
38h
72h
highest
MSRP
$750
lowest
$1,300
Movement
Miyota 9039
Seiko 6R55
Case
3 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners find Duckworth Prestex watches interesting and good value, with the Belmont model specifically noted for its wavy dial pattern. Some owners consider the brand's price point ambitious compared to other microbrands. Overall, owners find Duckworth Prestex watches interesting and good value, particularly liking the Belmont model for its wavy dial pattern.
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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