Certina DS Action Diver 40.5mm 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.

Certina DS Action Diver 40.5mm Powermatic 80 at true scale

DS Action Diver 40.5mm Powermatic 80

Serket Watch Co Reef Mariana at true scale

Reef Mariana

Diameter

40.5mm

40mm

Lug-to-Lug

45.0mm

lowest

47.5mm

Thickness

13.2mm

13.2mm

lowest

Water Resistance

300m

highest

200m

Power Reserve

80h

n/a

MSRP

$1,032

$449

lowest

Movement

POWERMATIC 80.611

Seiko NH35

Case

5 specs
Diameter
40.5mm
40mm
Thickness
13.22mm
13.2mm
Lug-to-Lug
45.01mm
47.5mm
Lug Width
19mm
20mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Dial Color
n/a
Orange
Lume
None
BGW9

Movement

2 specs
Caliber
POWERMATIC 80.611
Seiko NH35
Power Reserve
80h
n/a

Pricing

1 specs
MSRP
$1,032
$449
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Certina DS Action Diver 40.5mm Powermatic 80

Owners and reviewers widely praise the Certina DS Action Diver 40.5mm Powermatic 80 for its exceptional value, robust build quality, and ISO 6425 certification, with many highlighting its precise Powermatic 80.611 movement and excellent legibility. The watch is frequently lauded for its vibrant sunburst dials, clean design with gilt accents, and the smooth action of its engraved ceramic bezel. Some owners note the 40.5mm case's 14mm thickness as substantial, and a few find the end links do not perfectly align with the case, while others report accuracy between 3-6 seconds per day. Overall, owners and reviewers rate the Certina DS Action Diver 40.5mm Powermatic 80 highly for its impressive quality and value proposition in the dive watch market.

Serket Watch Co Reef Mariana

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.