Edox Grand Ocean 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.

Grand Ocean Automatic

Prospex Sea 1968 Heritage Diver's GMT
Diameter
40mm
42mm
Lug-to-Lug
n/a
48.6mm
Thickness
11.9mm
lowest
12.9mm
Water Resistance
300m
highest
200m
Power Reserve
n/a
72h
MSRP
$1,740
$1,500
lowest
Movement
Caliber 80 (SW 200)
Seiko 6R54
Case
4 specsCrystal & Dial
2 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Edox Grand Ocean Automatic for its impressive finishing and quality at its price point, with some noting it wears smaller than its 40mm case dimensions suggest. A reviewer found the watch charming and comfortable, though they flagged unnecessary dial labeling and less robust lume compared to dedicated sport watches. One owner noted difficulties finding aftermarket strap options for the Edox Grand Ocean Automatic. On balance, owners and reviewers generally regard the Edox Grand Ocean Automatic positively for its build quality and comfortable wearability.
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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