Serket Watch Co Reef X DivervsSeiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition
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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.

Reef X Diver

Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition
Diameter
43mm
42mm
Lug-to-Lug
50mm
48.6mm
lowest
Thickness
12.7mm
lowest
13.3mm
Water Resistance
200m
300m
highest
Power Reserve
n/a
72h
MSRP
$499
lowest
$1,750
Movement
Seiko NH35
Seiko 6R54
Case
5 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Serket Watch Co Reef X Diver as an exceptional tool for diving, even when compared to significantly more expensive timepieces. Reviewers note its attractive aesthetics, highlighting pleasing details and a slim bezel design. Overall, owners rate the Serket Watch Co Reef X Diver highly for its functional excellence and appealing visual design at its price point.
The Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition is widely praised for its excellent quality and finishing for its price, with reviewers highlighting its beautiful case, bracelet, and Lumibrite lume. Owners appreciate the comfortable 42mm case size and the 4 o'clock crown position. The watch features a sapphire crystal and uses the in-house 6R54 automatic movement with a three-day power reserve. Some reviewers note that the GMT function is secondary and that the bezel clicks are quieter than expected. The 4:30 date window splits opinion among enthusiasts, and it is described as a "caller GMT" rather than a true "traveller GMT." Overall, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch Limited Edition highly for its excellent value, quality finishing, and comfortable wearability.
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