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.

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

Seiko Prospex Sea models are widely praised for their excellent build quality, value for money, and comfortable wearability, with many appreciating the vintage-inspired designs and robust construction. Owners note the silicone straps are surprisingly comfortable and well-finished, and the Lumibrite lume is excellent. However, some find the 44.3mm size and thickness too large for smaller wrists, though others report the sizing as perfect. The 6R15 movement in some variants offers accuracy around +4 seconds per day with a 50-hour power reserve, while newer movements offer more. Some models are criticized for a bracelet width not matching the case size or a rudimentary clasp for their price point. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its impressive case work and finishing at its price point.

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 Sea41.3mm
Field III GMT40mm
Power Reserve
Prospex Sea72h
Field III GMT41h
Water Resistance
Prospex Sea300m
Field III GMT200m
MSRP
Prospex Sea$1,100
Field III GMT$459

Full specifications

Case

6 specs
Category
Diver
GMT
Diameter
41.3mm
40mm
Thickness
12.5mm
14mm
Lug-to-Lug
48.2mm
48.5mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
AR Coating
Anti-reflective coating on inner surface
Yes
Lume
LumiBrite on hands, index(es) and bezel
Super-LumiNova

Movement

4 specs
Caliber
6R55
Seiko Instruments NH38A
Power Reserve
72h
41h
Jewels
24
25
Complications
None
GMT

Pricing

1 specs
MSRP
$1,100
$459
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