Side by side

Fortis Marinemaster M-40vsGruppo Gamma Field III GMT Date

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Marinemaster M-40
FortisMarinemaster M-40
MSRP $3,520
Field III GMT Date
Gruppo GammaField III GMT Date
MSRP $459

At a glance

13 of 29 specs differ
Diameter
Marinemaster M-4040mm
Field III GMT Date40mm
Power Reserve
Marinemaster M-4038h
Field III GMT Date41h
Water Resistance
Marinemaster M-40300m
Field III GMT Date200m
MSRP
Marinemaster M-40$3,520
Field III GMT Date$459

Full specifications

Case

5 specs
Category
Diver
GMT
Thickness
13mm
14mm
Lug-to-Lug
48.5mm
Lug Width
21mm
22mm
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
Orange
Black
Lume
None
Super-LumiNova

Movement

4 specs
Caliber
Sellita SW220-1
Seiko Instruments NH38A
Power Reserve
38h
41h
Jewels
26
25
Complications
None
GMT, Date

Pricing

1 specs
MSRP
$3,520
$459

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Fortis Marinemaster M-40

Owners praise the Fortis Amber Orange for its gorgeous appearance and strong wrist presence, noting its crazy lume and 70-hour power reserve. The Doxa SUB 300T, described as having a superb, eccentric design with a highly legible dial and functional no-decompression bezel, uses an ETA 2824-2 movement. However, the SUB 300T's 42.5mm case wears large and its 14mm thickness is not ideal for dress shirts, though it boasts 1,200m water resistance. On balance, owners appreciate the Fortis Amber Orange for its striking aesthetics and impressive lume.

Gruppo Gamma Field III GMT Date

Owners widely praise the Gruppo Gamma Field III GMT Date for its awesome looks, quality, and good value. The watch features a 40mm brushed 316L stainless steel case, box sapphire crystal, and 200m water resistance, powered by a Seiko NH34A movement. Some reviewers note the NH34A movement's accuracy can range from -20~+40 seconds per day, though one reviewer reported +5 seconds per day with a regulated movement. The dial's dense layout with Arabic numerals can be overwhelming for some, and one owner found the size unsuitable for smaller wrists. On balance, owners rate the Gruppo Gamma Field III GMT Date highly for its impressive finishing and toolish design at its price point.

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