Side by side

Seiko AstronvsGruppo Gamma Field III GMT Date

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

Astron
SeikoAstron
MSRP $2,500
Field III GMT Date
Gruppo GammaField III GMT Date
MSRP $459

At a glance

14 of 29 specs differ
Diameter
Astron42mm
Field III GMT Date40mm
Power Reserve
Astron40h
Field III GMT Date41h
Water Resistance
Astron100m
Field III GMT Date200m
MSRP
Astron$2,500
Field III GMT Date$459

Full specifications

Case

6 specs
Diameter
42mm
40mm
Thickness
12.4mm
14mm
Lug-to-Lug
49.5mm
48.5mm
Lug Width
14mm
22mm
Material
Titanium
Stainless Steel
Water Resistance
100m
200m

Crystal & Dial

2 specs
AR Coating
Super-clear coating
Yes
Lume
LumiBrite on hands and index(es)
Super-LumiNova

Movement

5 specs
Caliber
5X83
Seiko Instruments NH38A
Type
Quartz
Automatic
Power Reserve
40h
41h
Jewels
14
25
Complications
None
GMT, Date

Pricing

1 specs
MSRP
$2,500
$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.

Seiko Astron

Owners widely praise the Seiko Astron for its spectacular technology, solar-powered quartz movement, and GPS time synchronization, making it a convenient grab-and-go option. The watch is frequently noted for its comfortable and lightweight titanium build, with some models featuring well-finished cases and robust ceramic bezels. Reviewers and owners alike highlight the dial's dynamic and shiny appearance, with textured hour markers and high-contrast edges. Accuracy is generally considered good, with figures ranging from +/- 15 seconds per month to within 1/2 second per day, easily corrected by GPS signal. However, some owners note that DST requires manual adjustment and that automatic time syncing depends on proximity to radio wave towers. The price point is a concern for some, who feel it competes with luxury watches without the same aesthetic appeal. One owner pointed out minimal lume and a slight misalignment of the minute hand on their model.

Gruppo Gamma Field III GMT Date

Owners widely praise the Gruppo Gamma Field III GMT Date for its awesome looks, quality, and good value. The watch features a 40mm brushed 316L stainless steel case, box sapphire crystal, and 200m water resistance, powered by a Seiko NH34A movement. Some reviewers note the NH34A movement's accuracy can range from -20~+40 seconds per day, though one reviewer reported +5 seconds per day with a regulated movement. The dial's dense layout with Arabic numerals can be overwhelming for some, and one owner found the size unsuitable for smaller wrists. On balance, owners rate the Gruppo Gamma Field III GMT Date highly for its impressive finishing and toolish design at its price point.

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