Certina DS Action GMT Powermatic 80vsSerket Watch Co Reef Mariana

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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.

DS Action GMT Powermatic 80

Reef Mariana
Diameter
41mm
40mm
Lug-to-Lug
49.5mm
47.5mm
lowest
Thickness
13.8mm
13.2mm
lowest
Water Resistance
200m
200m
Power Reserve
80h
n/a
MSRP
$1,286
$449
lowest
Movement
POWERMATIC 80.661
Seiko NH35
Case
3 specsCrystal & Dial
2 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Certina DS Action GMT Powermatic 80 is widely praised for its value, offering a traveler-style GMT with an 80-hour power reserve and flyer functionality. Owners and reviewers highlight its attractive, modern aesthetic and solid build quality, with one owner calling it a watch they are in love with. The green dial is noted as appealing, and the Powermatic 80 movement is considered fairly accurate. However, some find the 13.8mm thickness chunky, and a few owners report minor issues like a misaligned bezel or end links that do not perfectly align with the case. The bracelet's pin-and-collar sizing system is also mentioned as a missed opportunity. Overall, owners and reviewers rate the Certina DS Action GMT Powermatic 80 highly for its compelling value and true GMT functionality.
Owners widely praise the Serket Watch Co Reef Mariana for its excellent value, citing the sapphire crystal, ceramic bezel, and reliable Seiko NH35 automatic movement at its price point. Some owners note the bezel turns too easily and suggest the lume could be stronger. Overall, owners rate the Serket Watch Co Reef Mariana highly for its eye-catching dial and bezel combination and strong feature set for the price.
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