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
14 of 29 specs differDiameter
Strat-o-timer GMT42mm
Prospex Sea41mm
Power Reserve
Strat-o-timer GMT40h
Prospex Sea70h
Water Resistance
Strat-o-timer GMT200m
Prospex Sea200m
MSRP
Strat-o-timer GMT$1,149
Prospex Sea$900
Full specifications
Case
6 specsCategory
—
Diver
Diameter
42mm
41mm
Thickness
13.2mm
12.3mm
Lug-to-Lug
49mm
46.9mm
Lug Width
22mm
20mm
Material
316L Stainless Steel
Stainless Steel
Crystal & Dial
4 specsCrystal Shape
Flat
Curved
AR 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
6R35
Power Reserve
40h
70h
Jewels
25
24
Pricing
1 specsMSRP
$1,149
$900
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