Sangin Instruments Atlas IIIvsSeiko 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.

Atlas III

Prospex Sea 1968 Heritage Diver's GMT
Diameter
42mm
42mm
Lug-to-Lug
n/a
48.6mm
Thickness
n/a
12.9mm
Water Resistance
200m
200m
Power Reserve
n/a
72h
MSRP
$949
lowest
$1,500
Movement
La Joux-Perret G100
Seiko 6R54
Case
4 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Sangin Instruments Atlas III for its great quality and value, with one owner noting it is hundreds of dollars cheaper than alternatives. The watch is reported to be in excellent condition with minor rub marks visible only up close and is keeping very good time. Some owners find the omission of minute indices bothersome, and one owner prefers a different model due to its smaller case size and lug geometry. Overall, owners rate the Sangin Instruments Atlas III highly for its excellent quality and value from a lesser-known company.
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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