Side by side
Jack Mason Strat-o-timer GMTvspOrtahl Zenmaster
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
9 of 29 specs differDiameter
Strat-o-timer GMT40mm
Zenmaster40.5mm
Power Reserve
Strat-o-timer GMT42h
Zenmaster42h
Water Resistance
Strat-o-timer GMT200m
Zenmaster100m
MSRP
Strat-o-timer GMT$1,099
Zenmaster$599
Full specifications
Case
6 specsDiameter
40mm
40.5mm
Thickness
13.2mm
10.2mm
Lug-to-Lug
47mm
—
Lug Width
20mm
—
Material
Stainless Steel
316L Stainless Steel
Water Resistance
200m
100m
Movement
2 specsCaliber
Miyota 9075
Miyota 9015
Power Reserve
42h
42h
Pricing
1 specsMSRP
$1,099
$599
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