The Wristwatch Field Guide

Seiko Astron GPS Solar (SSH157)

SSH157J1

The Seiko Astron GPS Solar (SSH157) is a current-production other watch with a grey titanium (super-hard coated) case, finished with super-hard coating; ceramic bezel. It measures 43.3 mm across, 13.4 mm thick, 49.5 mm lug to lug, 117 g, and is water resistant to 100 m. Inside is the Seiko 5X83 gps solar movement, with 6 months (full charge) power reserve. Complications: Chronograph, Worldtimer, GMT, Perpetual calendar, Power reserve, Date. Priced from $2,500 (limited to 1,500). Brand origin: Japan.

Titanium and ceramic other watchesTitaniumGMTUnder $5,000Chronograph
Reference
SSH157J1
Type
Other
Price
$2,500 · limited to 1,500
Case diameter
43.3 mm
Thickness
13.4 mm
Lug-to-lug
49.5 mm
Water resistance
100 m
Weight
117 g
Origin
Japan
Movement
GPS Solar
Caliber
Seiko 5X83
Power reserve
6 months (full charge)
Complications
Chronograph, Worldtimer, GMT, Perpetual calendar, Power reserve, Date
Material
Titanium
Grade / type
Titanium (super-hard coated)
Colour
Grey
Hardness
Construction
Surface treatment
Super-hard coating; ceramic bezel
Caseback
Titanium
Nickel-free
Yes
Bracelet / strap
Titanium bracelet
Matching bracelet
Standard
Crystal
Sapphire (dual-curved, super-clear coating)
Display back
No
Dial
Blue (Infinite Starry Sky)
Lume
LumiBrite
Availability
Offered
Status
Limited edition of 1,500 (2024)
High confidence Verified Jun 2026 Source: Seiko (maker) / aBlogtoWatch Maker / listing ↗
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Frequently asked questions

Is the Seiko Astron GPS Solar (SSH157) nickel-free?

Yes. Nothing nickel-bearing touches the skin: a grey titanium (super-hard coated) case with a titanium caseback, plus a non-steel crown and bracelet and clasp. The Wristwatch Field Guide marks it nickel-free for whole-watch skin contact. If your allergy is severe, confirm the contact points with the maker.

What is the case material of the Seiko Astron GPS Solar (SSH157)?

The Seiko Astron GPS Solar (SSH157) has a grey titanium (super-hard coated) case with a titanium caseback. This is confirmed against the maker spec.

What size is the Seiko Astron GPS Solar (SSH157)?

It is 43.3 mm in diameter, 13.4 mm thick, 49.5 mm lug to lug, and water resistant to 100 m.

How much does the Seiko Astron GPS Solar (SSH157) weigh?

About 117 g.

How much does the Seiko Astron GPS Solar (SSH157) cost, and is it available?

It is current-production and lists from $2,500.

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