The Titanium Field Guide

Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158

The Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158 is a current-production chronograph watch with a titanium (black super-hard coating) case, finished with black super-hard coating. At 106 g it sits around the middle for chronograph watches in the guide. It ships on a matching titanium bracelet rather than a strap.

All Seiko watchesWatch chronograph watchesLightest, rankedOn a titanium braceletSolarGMT
Material
Titanium
Grade / type
Titanium (black super-hard coating)
Weight
106 g (with bracelet)
Water resistance
100 m
Type
Chronograph
Case diameter
43.4 mm
Thickness
14.1 mm
Lug-to-lug
49.5 mm
Origin
Japan
Movement
GPS solar quartz chronograph
Caliber
5X83
Power reserve
6 months (full charge)
Complications
Chronograph, GMT, Date
Colour
Black
Surface treatment
Black super-hard coating
Finish technology
Surface hardening
Nickel-free
Unconfirmed (contact-point materials not all confirmed)
Bracelet / strap
Titanium bracelet, black super-hard coating
Matching bracelet
Standard
Crystal
Sapphire
Display back
No
Dial
Black (radial striped pattern, rose-gold accents)
Dial colours
Black
Availability
Offered
Status
Limited edition of 1,200
Not published
Reference, Price, Hardness, Construction, Caseback, Lume
Medium confidence Verified Jul 2026 Source: Seiko (Astron SSH158)
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Frequently asked questions

What is the case material of the Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158?

The Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158 has a titanium (black super-hard coating) case. It is recorded at medium confidence pending a maker-stated material.

What size is the Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158?

It is 43.4 mm in diameter, 14.1 mm thick, 49.5 mm lug to lug, and water resistant to 100 m.

How much does the Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158 weigh?

About 106 g (w/ bracelet).

How much does the Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158 cost, and is it available?

It is current-production; the guide does not list a price for it.

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