Side by side
Jack Mason Strat-o-timer GMTvsSheffield Deep Gray 300
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
6 of 29 specs differDiameter
Strat-o-timer GMT42mm
Deep Gray 30042mm
Power Reserve
Strat-o-timer GMT40h
Deep Gray 30040h
Water Resistance
Strat-o-timer GMT200m
Deep Gray 300300m
MSRP
Strat-o-timer GMT$1,149
Deep Gray 300$258
Full specifications
Case
4 specsThickness
13.2mm
13.8mm
Lug-to-Lug
49mm
52mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
200m
300m
Movement
1 specsCaliber
Miyota 9075
Seiko NH35
Pricing
1 specsMSRP
$1,149
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