Side by side

Formex Reef 39.5 mmvsGruppo Gamma Field III GMT

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

Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230
Field III GMT
Gruppo GammaField III GMT
MSRP $459

At a glance

11 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Field III GMT40mm
Power Reserve
Reef 39.5 mm56h
Field III GMT41h
Water Resistance
Reef 39.5 mm300m
Field III GMT200m
MSRP
Reef 39.5 mm$2,230
Field III GMT$459

Full specifications

Case

5 specs
Category
Diver
GMT
Diameter
39.5mm
40mm
Thickness
11mm
14mm
Lug-to-Lug
45.5mm
48.5mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
AR Coating
Inner
Yes
Dial Color
Bahama Blue
Black

Movement

3 specs
Caliber
Sellita SW300-1
Seiko Instruments NH38A
Power Reserve
56h
41h
Complications
None
GMT

Pricing

1 specs
MSRP
$2,230
$459

Follow this matchup

Get a note when Formex Reef 39.5 mm vs Gruppo Gamma Field III GMT gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

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

Formex Reef 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, comfortable and well-proportioned case design, and impressive specifications for its price point, including COSC-certified Sellita SW300-1 movement and 300m water resistance. Owners and reviewers highlight the tool-less micro-adjust clasp and quick-release spring bars as practical features. Some reviewers note that the 22mm lug width feels slightly disproportionate to the smaller case, and the bracelet could benefit from more taper, though this is a point of contention for some owners who value the overall package. A prototype crown protrusion issue is noted as being addressed for production. On balance, owners and reviewers rate the Formex Reef 39.5 mm highly for its excellent value and well-executed design.

Gruppo Gamma Field III GMT

Owners praise the Gruppo Gamma Field III GMT for its look and value, with specific mentions of its sandwich dial and comfortable OEM straps. One owner notes incredible quality for the price across their Gruppo Gamma watches. The watch features a 40mm brushed stainless steel case, box sapphire crystal, and a Seiko NH34A movement with a 41-hour power reserve and stated accuracy of -20~+40 s/day. Some find the lack of a date window a drawback for a GMT, and question its differentiation from other NH34-powered watches. On balance, owners and reviewers find the Gruppo Gamma Field III GMT to be a good value with quality construction for its price point.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.