Side by side

Seestern S456 GMTvsGruppo Gamma Field III GMT

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

S456 GMT
SeesternS456 GMT
MSRP $299
Field III GMT
Gruppo GammaField III GMT
MSRP $459

At a glance

14 of 29 specs differ
Diameter
S456 GMT41mm
Field III GMT40mm
Power Reserve
S456 GMT41hh
Field III GMT41h
Water Resistance
S456 GMT200m
Field III GMT200m
MSRP
S456 GMT$299
Field III GMT$459

Full specifications

Case

6 specs
Diameter
41mm
40mm
Thickness
13mm
14mm
Lug-to-Lug
49mm
48.5mm
Lug Width
20mm
22mm
Material
316L Stainless Steel
Stainless Steel
Finish
Brushed + Polished
Brushed and polished

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
Sunray style, applied and Diamond cut Indices, C1 lume
Black
Lume
C1
Super-LumiNova

Movement

4 specs
Caliber
Seiko NH34
Seiko Instruments NH38A
Beat Rate
3 vph
28,800 vph
Power Reserve
41hh
41h
Jewels
24
25

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 S456 GMT

Owners widely praise the Seestern S456 GMT for its exceptional value and finishing that exceeds expectations, with one owner noting its accuracy surpasses that of their Seiko 5. The dial displays a pearl-like rainbow effect. Some owners would prefer a bidirectional bezel over the current unidirectional one. The Seestern S456 GMT features an NH34 movement, a 39.5mm case, sapphire crystal, and an adjustable clasp. On balance, owners rate the Seestern S456 GMT highly for its impressive finishing and value proposition at its price point.

From video reviewers

The watch features stunning, detailed finishing that is difficult to top. Reviewers did not reach a consensus on any weaknesses.

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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