Side by side

Seiko Prospex SeavsGruppo Gamma Field III GMT

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

Prospex Sea
SeikoProspex Sea
MSRP $595
Field III GMT
Gruppo GammaField III GMT
MSRP $459
What people say

Owners + reviewers, side by side

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

Seiko Prospex Sea

Owners and reviewers widely praise the Seiko Prospex Sea for its excellent value, robust build, and superior lume, with many noting its comfortable wearability and faithful design recreations. Some owners report the watch can feel big, thick, and heavy on smaller wrists, while others find the sizing perfect. The bezel action is frequently highlighted as smooth and precise, often exceeding that of less expensive models. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its impressive finishing and value proposition.

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.

At a glance

13 of 29 specs differ
Diameter
Prospex Sea41.7mm
Field III GMT40mm
Power Reserve
Prospex Sea41h
Field III GMT41h
Water Resistance
Prospex Sea200m
Field III GMT200m
MSRP
Prospex Sea$595
Field III GMT$459

Full specifications

Case

5 specs
Category
Diver
GMT
Diameter
41.7mm
40mm
Thickness
12.3mm
14mm
Lug-to-Lug
49.5mm
48.5mm
Lug Width
20mm
22mm

Crystal & Dial

3 specs
Crystal
Hardlex
Sapphire
AR Coating
Inner
Yes
Lume
LumiBrite on hands, index(es) and bezel
Super-LumiNova

Movement

4 specs
Caliber
4R35
Seiko Instruments NH38A
Power Reserve
41h
41h
Jewels
23
25
Complications
None
GMT

Pricing

1 specs
MSRP
$595
$459
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