Side by side

Spinnaker Dumas AutomaticvsSeiko Astron GPS Solar 2026 Limited Edition

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

Dumas Automatic
SpinnakerDumas Automatic
MSRP $239
Astron GPS Solar 2026 Limited Edition
SeikoAstron GPS Solar 2026 Limited Edition
MSRP $2,400

At a glance

14 of 29 specs differ
Diameter
Dumas Automatic44mm
Astron GPS Solar 2026 Limited Edition41.2mm
Power Reserve
Dumas Automatic40h
Astron GPS Solar 2026 Limited Edition40h
Water Resistance
Dumas Automatic300m
Astron GPS Solar 2026 Limited Edition100m
MSRP
Dumas Automatic$239
Astron GPS Solar 2026 Limited Edition$2,400

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
44mm
41.2mm
Thickness
15mm
12mm
Lug-to-Lug
48mm
48.6mm
Lug Width
22mm
14mm
Material
316L Stainless Steel
Titanium
Water Resistance
300m
100m

Crystal & Dial

3 specs
AR Coating
Inner
Super-clear coating
Dial Color
Blue
Black
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
SII NH35A
3X62
Type
Automatic
Quartz
Jewels
25
10

Pricing

1 specs
MSRP
$239
$2,400

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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.

Spinnaker Dumas Automatic

Owners widely praise the Spinnaker Dumas Automatic for its attractive textured blue dial, applied indices, and well-finished case, noting its comfortable wearability due to a short lug-to-lug distance. Some owners flag the use of mineral crystal instead of sapphire and a bracelet with a learning curve and loose keeper. Overall, owners rate the Spinnaker Dumas Automatic highly for its aesthetics and case finishing at its price point.

Seiko Astron GPS Solar 2026 Limited Edition

The Seiko Astron GPS Solar 2026 Limited Edition is noted for its advanced GPS timekeeping that automatically updates time and date via satellite signals, powered by light to eliminate battery changes. Owners appreciate its design and texture, and the legible dial despite its complexity, with one owner preferring its less overloaded appearance over other Astron models. However, the GPS function requires a clear outdoor line-of-sight to the sky for reception, which can be an issue indoors or in dense urban environments, and DST is not implemented. The watch is priced over $2,000, and while it features a perpetual calendar, it only displays the date. Overall, owners and reviewers find the Seiko Astron GPS Solar 2026 Limited Edition a functional and appealing watch, particularly for its automatic timekeeping and solar power, though its GPS reception limitations and price point are noted considerations.

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