Islander Bayport Automatic DivervsSeiko Prospex Sea 1968 Heritage Diver's GMT

Ref. islander-bayport-automatic-dive-watch-with-silver-white-wave-dial-isl-313·MSRP $349
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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.

Bayport Automatic Diver

Prospex Sea 1968 Heritage Diver's GMT
Diameter
40mm
42mm
Lug-to-Lug
40mm
lowest
48.6mm
Thickness
13.5mm
13.3mm
lowest
Water Resistance
200m
300m
highest
Power Reserve
n/a
72h
MSRP
$349
lowest
$1,700
Movement
Seiko NH35
Seiko 6R54
Case
4 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 Islander Bayport Automatic Dive Watch for its versatile 40mm case size and retro styling, featuring a unique grey dial with a framed date window and a pie pan design. Reviewers and owners alike highlight the watch's well-executed finishing with chamfered edges, a tight 120-click bezel, and the reliable Seiko NH35 automatic movement. Accuracy reports vary, with some owners seeing between -3 and +6 seconds per day, while others note that the NH36 movement in comparable models can be regulated to achieve near-zero daily deviation. Overall, owners and reviewers consider the Islander Bayport Automatic Dive Watch an exceptional value proposition for the brand.
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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