BERNY Compressor-style Diver V4 AM439MSvsSeiko Prospex Sea 1968 Heritage Diver's GMT 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.

Compressor-style Diver V4 AM439MS

Prospex Sea 1968 Heritage Diver's GMT Limited Edition
Diameter
42mm
42mm
Lug-to-Lug
49mm
48.6mm
lowest
Thickness
13.5mm
13.3mm
lowest
Water Resistance
200m
300m
highest
Power Reserve
n/a
72h
MSRP
$154
lowest
$1,750
Movement
Miyota 8215
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.
The BERNY BERNY-Men Automatic Compressor-style Diver Watch V4-AM439MS is praised for its solid build, comfortable wear, and great lume, with owners specifically noting the exceptional anti-reflective coating on its sapphire crystals, which some feel surpasses that on watches from Citizen and San Martin. The watch features a Miyota 8215 automatic movement, 200m water resistance, and a 42mm case, with one owner highlighting the second crown's function for controlling the inner bezel. It was purchased for as low as $70 on AliExpress. Overall, owners rate the BERNY BERNY-Men Automatic Compressor-style Diver Watch V4-AM439MS highly for its impressive build quality and visual appeal 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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