The Titanium Field Guide

Seiko Astron GPS Solar Dual-Time Sport SSH117

The Seiko Astron GPS Solar Dual-Time Sport SSH117 is a current-production watch with a titanium (super titanium) case, finished with super-hard coating. It is priced above the $1,425 median across the guide. The maker states no nickel-bearing steel at any skin-contact point, across the case, caseback and bracelet.

All Seiko watchesWatch other watchesUnder $3,000SolarWorldtimerPerpetual calendarGMT
Price
$2,300
Material
Titanium
Grade / type
Titanium (Super Titanium)
Water resistance
200 m
Type
Other
Case diameter
43.1 mm
Origin
Japan
Movement
GPS Solar
Caliber
Seiko 5X53
Power reserve
6 months
Complications
GMT, Worldtimer, Perpetual calendar
Colour
Grey
Surface treatment
Super-hard coating
Finish technology
Surface hardening
Caseback
Titanium
Nickel-free
Maker states none
Bracelet / strap
Titanium
Crystal
Sapphire
Display back
No
Dial
Black
Dial colours
Black
Lume
LumiBrite
Availability
Offered
Status
Current
Not published
Reference, Thickness, Lug-to-lug, Weight, Hardness, Construction, Matching bracelet
High confidence Verified Aug 2026 Source: Seiko Spec checksGrade Jul 2026Price Aug 2026 medium
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Frequently asked questions

Is the Seiko Astron GPS Solar Dual-Time Sport SSH117 nickel-free?

On the maker's published specification, no nickel-bearing steel touches the skin: a titanium (super titanium) case with a titanium caseback, plus a non-steel crown and bracelet and clasp. That is what the guide records rather than a test of the watch, so confirm the contact points with the maker before buying if you react to nickel.

What is the case material of the Seiko Astron GPS Solar Dual-Time Sport SSH117?

The Seiko Astron GPS Solar Dual-Time Sport SSH117 has a titanium (super titanium) case with a titanium caseback. This is confirmed against the maker spec.

What size is the Seiko Astron GPS Solar Dual-Time Sport SSH117?

It is 43.1 mm in diameter, and water resistant to 200 m.

How much does the Seiko Astron GPS Solar Dual-Time Sport SSH117 cost, and is it available?

It is current-production and lists from $2,300.

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