The Titanium Field GuidePicks of the month

Seiko Astron GPS Solar Dual-Time Chronograph (5X63)

HAB001

The Seiko Astron GPS Solar Dual-Time Chronograph (5X63) is a 43.4 mm titanium chronograph with a 5X63 solar quartz movement. The case is surface-hardened, which guards against the scuffs bare titanium picks up.

All Seiko watchesChronograph watchesUnder $3,000On a titanium braceletMicro-adjust braceletSolarGMT
Price
$2,700
Material
Titanium
Grade / type
Titanium (super-hard coating)
Water resistance
100 m
Reference
HAB001
Type
Chronograph
Case diameter
43.4 mm
Thickness
12.4 mm
Origin
Japan
Movement
GPS solar quartz chronograph
Caliber
5X63
Power reserve
6 months (full charge)
Complications
Chronograph, GMT, Date
Colour
Grey
Surface treatment
Super-hard coating
Finish technology
Surface hardening
Nickel-free
Unconfirmed (contact-point materials not all confirmed)
Bracelet / strap
Semi-integrated titanium three-link bracelet (HAB003 on silicone strap)
Matching bracelet
Standard
Micro-adjust clasp
Yes
Crystal
Sapphire
Display back
No
Dial
Blue-gray on bracelet (HAB001), sibling HAB002 (bracelet) and HAB003 (silicone strap)
Dial colours
Grey Blue
Availability
Offered
Status
Current (2026, new 5X63 caliber)
Not published
Lug-to-lug, Weight, Hardness, Construction, Caseback, Lume
Medium confidence Verified Jul 2026 Source: Seiko (Astron HAB001)
Facts are free to cite with a link.
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Alternatives to the Seiko Astron GPS Solar Dual-Time Chronograph (5X63)

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Frequently asked questions

What grade of titanium is the Seiko Astron GPS Solar Dual-Time Chronograph (5X63)?

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 Dual-Time Chronograph (5X63)?

The case is 43.4 mm across and 12.4 mm thick. It is water resistant to 100 m.

How much does the Seiko Astron GPS Solar Dual-Time Chronograph (5X63) cost, and is it available?

It is in production, at a list price of $2,700.

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