Side by side
Jack Mason Strat-o-timer GMTvsGruppo Gamma Field III GMT Date
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
Field III GMT Date40mm
Power Reserve
Strat-o-timer GMT40h
Field III GMT Date41h
Water Resistance
Strat-o-timer GMT200m
Field III GMT Date200m
MSRP
Strat-o-timer GMT$1,149
Field III GMT Date$459
Full specifications
Case
5 specsCategory
—
GMT
Diameter
42mm
40mm
Thickness
13.2mm
14mm
Lug-to-Lug
49mm
48.5mm
Material
316L Stainless Steel
Stainless Steel
Crystal & Dial
3 specsAR Coating
Inner
Yes
Dial Color
—
Black
Lume
None
Super-LumiNova
Movement
3 specsCaliber
Miyota 9075
Seiko Instruments NH38A
Power Reserve
40h
41h
Complications
None
GMT, Date
Pricing
1 specsMSRP
$1,149
$459
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