Smiths Sewills Professional Diver PRS-44vsSteinhart Ocean One BLACK DLC
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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.

Sewills Professional Diver PRS-44

Ocean One BLACK DLC
Diameter
42mm
42mm
Lug-to-Lug
50mm
n/a
Thickness
13mm
lowest
14mm
Water Resistance
300m
300m
Movement
ETA 2824-2
ETA 2824-2
Case
2 specsThickness
13mm
14mm
Lug-to-Lug
50mm
n/a
Crystal & Dial
3 specsCrystal Shape
n/a
Domed
AR Coating
n/a
Yes
Lume
SuperLuminova
Super-LumiNova BGW9
Movement
1 specsPower Reserve
n/a
0h
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