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.

Duckworth Prestex Belmont 300 Automatic at true scale

Belmont 300 Automatic

Seiko Prospex Sea 1968 Heritage Diver's GMT at true scale

Prospex Sea 1968 Heritage Diver's GMT

Diameter

42mm

42mm

Lug-to-Lug

50mm

48.6mm

lowest

Thickness

13mm

12.9mm

lowest

Water Resistance

300m

highest

200m

Power Reserve

38h

72h

highest

MSRP

$750

lowest

$1,500

Movement

Miyota 9039

Seiko 6R54

Case

4 specs
Thickness
13mm
12.9mm
Lug-to-Lug
50mm
48.6mm
Lug Width
n/a
20mm
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
n/a
n/a
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Miyota 9039
Seiko 6R54
Power Reserve
38h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$750
$1,500
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Reviews

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

Duckworth Prestex Belmont 300 Automatic

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.

Seiko Prospex Sea 1968 Heritage Diver's GMT

The Seiko Prospex Sea 1968 Heritage Diver's GMT is widely praised for its build quality, finishing, and value, with owners noting its comfortable wearability and attractive aesthetic, particularly the silver/white sunray dial and blue ceramic bezel. The improved bracelet clasp with excellent micro-adjustment is a recurring positive point. Some owners report accuracy figures of +3 seconds per day or +/- 5 seconds per day, exceeding the movement's stated range. However, the GMT functionality is considered secondary to its dive watch capabilities by some, with the GMT scale being difficult to read and the caller-style GMT movement being a drawback for certain users. The dial contrast is also noted as lacking by some, and the crown at 4 o'clock is undesirable for a few. On balance, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT highly for its blend of dive watch character and GMT functionality, offering significant features for its price.

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