Duckworth Prestex Belmont 300 AutomaticvsSeiko Prospex Sea 1968 Heritage Diver's GMT

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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 1968 Heritage Diver's GMT
Diameter
42mm
42mm
Lug-to-Lug
50mm
48.6mm
lowest
Thickness
13mm
lowest
13.3mm
Water Resistance
300m
300m
Power Reserve
38h
72h
highest
MSRP
$750
lowest
$1,700
Movement
Miyota 9039
Seiko 6R54
Case
3 specsCrystal & Dial
3 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 and reviewers widely praise the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch for its excellent value, Marinemaster-style build, and comfortable 42mm steel case with a 4:00 crown position. The watch features a refined clasp with an impressive 15mm of micro-adjustment and a caller-style GMT complication. While the 6R54 movement's stated accuracy is +25 to -15 seconds per day, real-world performance is often found to be better. The watch is priced at $1,700 USD. Overall, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch highly for its attractive design and robust build quality at its price point.
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