SEIKO ASTRON HAB001J1 GPS SOLAR DUAL-TIME CHRONOGRAPH MEN WATCH

The Seiko Astron HAB001J1 introduces Calibre 5X63, the newest GPS Solar movement in the Astron collection and the first to run its chronograph out to 24 hours rather than 12. That single change reframes what the watch is for: a full day of elapsed time on one measurement, in 1/20-second increments, with split-time capability. The second time zone also moves to a 24-hour sub-dial, which removes any ambiguity about whether it is morning or evening where you are not.

The case is new too. At 43.4mm across and 12.4mm thick, it is noticeably slimmer than the outgoing generation, built in titanium with a super-hard coating and fitted with a two-piece octagonal titanium bezel — brushed across the top, polished down the faceted sides. The blue-grey dial carries a geometric pattern of interlocking triangles behind three horizontally arranged sub-dials, and the case takes a quick-change strap system: press a button, the bracelet comes off, press a silicone strap into place and it is secure.

At a Glance

• BrandSeiko
• CollectionAstron GPS Solar
• MovementCalibre 5X63 GPS Solar
• Case Size43.4mm
• DialBlue-Grey, Textured
• BezelTwo-Piece Octagonal Titanium
• Case MaterialTitanium (Super-Hard Coating)
• GlassSapphire (Super-Clear Coating)
• FunctionsDual Time + 24-Hour Chronograph
• Water Resistance100m (10 BAR)
• BraceletTitanium, Quick-Change System
• Power ReserveApprox. 6 Months

Why You'll Love It

• A 24-hour chronograph. Most stopwatches cap out at 12 hours, which means anything longer has to be tracked in your head. This one measures a full day in one go, with split times along the way.
• It sets itself. The watch connects to the GPS network to adjust its time and time zone, with a high-speed time zone adjustment and automatic daylight saving correction on top.
• Light alone runs it — approximately six months from a full charge, with a power save mode of around two years. No battery to replace.
• The quick-change system means one press of a button swaps the titanium bracelet for a silicone strap. Same watch, completely different register, no tools and no trip to a service counter.
• Perpetual calendar to 2100 and a world time function covering 38 time zones — the date and day never need correcting, and the whole map is on the watch.

Key Features

• Calibre 5X63 GPS Solar movement — the newest GPS Solar calibre in the Astron collection, combining dual-time capability with a 24-hour chronograph. Stated accuracy is ±15 seconds per month without a GPS signal, at temperatures between 5°C and 35°C.
• Chronograph up to 24 hours in 1/20-second increments — the 1/20-second counter sits at 9 o'clock, and the 24-hour counter (hours and minutes) runs at 6 o'clock during chronograph operation. Split-time capability lets you record an intermediate reading without stopping the count.
• Dual time on a 24-hour display — the second time zone is read in hours and minutes on a 24-hour sub-dial, so there is no separate AM/PM indicator to interpret. The main hands can also be set manually to a different zone.
• GPS time and time zone adjustment — with high-speed time zone adjustment, automatic daylight saving adjustment, a time transfer function to swap main dial and sub-dial readings, and a signal reception result indication.

Technical Specifications

Frequently Asked Questions

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