The Wristwatch Field Guide

Seiko Astron GPS Solar (SSH157)

SSH157J1 Archive · used only

The Seiko Astron GPS Solar (SSH157) is a discontinued watch with a titanium (super-hard coated) case, finished with super-hard coating; ceramic bezel. At 117 g it sits around the middle for watches in the guide, and is priced above the $1,500 median across the guide. Nothing touching the skin is nickel-bearing steel, verified across the case, caseback and bracelet. No longer offered new; listed here as an archive reference for the used market.

All Seiko watchesExotic-material other watchesTitaniumGMTUnder $5,000Chronograph
Price
$2,500
Material
Titanium
Grade / type
Titanium (super-hard coated)
Weight
117 g
Water resistance
100 m
Reference
SSH157J1
Type
Other
Case diameter
43.3 mm
Thickness
13.4 mm
Lug-to-lug
49.5 mm
Origin
Japan
Movement
GPS Solar
Caliber
Seiko 5X83
Power reserve
6 months (full charge)
Complications
Chronograph, Worldtimer, GMT, Perpetual calendar, Power reserve, Date
Colour
Grey
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)
Dial colours
Blue
Lume
LumiBrite
Availability
No longer offered
Status
No longer offered (2024 limited edition of 1,500, sold out and removed from the Seiko lineup)
Not published
Hardness, Construction
High confidence Verified Jul 2026 Source: Seiko (maker) / aBlogtoWatch
Facts are free to cite with a link.
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Frequently asked questions

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

Yes. Nothing nickel-bearing touches the skin: a 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 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 no longer offered new; the guide keeps it as an archive reference for the used market, and it listed from $2,500 when current.

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