Side by side
Jack Mason Strat-o-timer GMTvsSeiko Prospex Sea
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
12 of 29 specs differDiameter
Strat-o-timer GMT42mm
Prospex Sea43.8mm
Power Reserve
Strat-o-timer GMT40h
Prospex Sea41h
Water Resistance
Strat-o-timer GMT200m
Prospex Sea200m
MSRP
Strat-o-timer GMT$1,149
Prospex Sea$625
Full specifications
Case
5 specsCategory
—
Diver
Diameter
42mm
43.8mm
Thickness
13.2mm
12.8mm
Lug-to-Lug
49mm
48.7mm
Material
316L Stainless Steel
Stainless Steel
Crystal & Dial
3 specsAR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
—
Black
Lume
None
LumiBrite on hands, index(es) and bezel
Movement
3 specsCaliber
Miyota 9075
4R35
Power Reserve
40h
41h
Jewels
25
23
Pricing
1 specsMSRP
$1,149
$625
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