Side by side
Aera Instruments M-1vsGruppo Gamma Field III GMT Date
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
13 of 29 specs differDiameter
M-139mm
Field III GMT Date40mm
Power Reserve
M-142h
Field III GMT Date41h
Water Resistance
M-1100m
Field III GMT Date200m
MSRP
M-1—
Field III GMT Date$459
Full specifications
Case
6 specsCategory
—
GMT
Diameter
39mm
40mm
Thickness
13.14mm
14mm
Lug-to-Lug
47.6mm
48.5mm
Lug Width
20mm
22mm
Water Resistance
100m
200m
Crystal & Dial
2 specsAR Coating
Inner
Yes
Dial Color
Dune
Black
Movement
4 specsCaliber
Sellita SW216-1
Seiko Instruments NH38A
Type
Manual
Automatic
Power Reserve
42h
41h
Complications
None
GMT, Date
Pricing
1 specsMSRP
—
$459
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