Side by side

Seestern S450 Ocean StarvsGruppo Gamma Field III GMT

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

S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299
Field III GMT
Gruppo GammaField III GMT
MSRP $459

At a glance

15 of 29 specs differ
Diameter
S450 Ocean Star40mm
Field III GMT40mm
Power Reserve
S450 Ocean Star41h
Field III GMT41h
Water Resistance
S450 Ocean Star100m
Field III GMT200m
MSRP
S450 Ocean Star$299
Field III GMT$459

Full specifications

Case

6 specs
Category
Diver
GMT
Thickness
12mm
14mm
Lug-to-Lug
48mm
48.5mm
Lug Width
20mm
22mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
100m
200m

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
White
Black
Lume
Tritium
Super-LumiNova

Movement

5 specs
Caliber
TMI NH35A
Seiko Instruments NH38A
Beat Rate
21,600 vph
28,800 vph
Power Reserve
41h
41h
Jewels
24
25
Complications
GMT, Date
GMT

Pricing

1 specs
MSRP
$299
$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.

Seestern S450 Ocean Star

Owners widely praise the Seestern S450 Ocean Star's Yachtmaster-style case and flawless bracelet finishing, with one owner noting the ST2130 movement keeps good time. The bezel action is described as having individual notches but feeling like a friction bezel, while another owner flags the bezel and crown action as smooth with perfect alignment. Lume is a point of contention, with one source describing it as a nice cool blue with ice-white application, while others note it as weak or not matching Prospex standards, despite using BGW-9. The watch is considered a "big boy" ideal for larger wrists (19cm+), potentially too large for 17cm wrists due to its size and non-tapering bracelet. Overall, owners rate the Seestern S450 Ocean Star highly for its build quality and finishing at the price point, despite some reservations about its size and lume intensity.

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.

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