The Titanium Field GuidePicks of the month

Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158

The Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158 is a 43.4 mm titanium chronograph with a 5X83 solar quartz movement. The case is surface-hardened, which guards against the scuffs bare titanium picks up.

All Seiko watchesChronograph watchesLightest, rankedOn a titanium braceletMicro-adjust 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
Micro-adjust clasp
Yes
Crystal
Sapphire
Display back
No
Dial
Black (radial striped pattern, rose-gold accents)
Dial colours
Black
Availability
Offered
Status
Limited edition of 1,200. It has left the us-en site but is listed in 17 other Seiko locale sitemaps (62,990 urls read 2026-09-29), so the record now cites the uk-en page.
Not published
Reference, Price, Hardness, Construction, Caseback, Lume
Medium confidence Verified Sep 2026 Source: Seiko (Astron SSH158) Spec checksGrade Jul 2026Weight Jul 2026
Facts are free to cite with a link.
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Frequently asked questions

What grade of titanium is the Seiko Astron GPS Solar Chronograph 100th Anniversary LE SSH158?

Titanium, with no grade stated. The record is at medium confidence, so check the maker's page before relying on it.

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

The case is 43.4 mm across, 14.1 mm thick and 49.5 mm from lug to lug. It is water resistant to 100 m.

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

About 106 g on its bracelet.

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

It is in production, but the maker does not publish a price.

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