SEIKO ASTRON HAB005J1 GPS SOLAR 2026 CHRONOGRAPH LIMITED EDITION MEN WATCH

The Seiko Astron HAB005J1 is a limited edition of 1,200 pieces worldwide, built on the newest GPS Solar platform and given a dial that has no equivalent in the standing range. Seiko calls the colour Crystal Green, taken from green quartz, and the dial carries a newly developed pressed pattern of multiple facets meant to catch light the way a cut quartz crystal does. Against the black sub-dials, the green reads far brighter than the blue-grey and black references it sits alongside.

Underneath is Calibre 5X63, the first Astron movement to run its chronograph out to 24 hours in 1/20-second increments with split-time capability, and the first to put the second time zone on a 24-hour sub-dial. The titanium case measures 43.4mm across, 50.0mm lug-to-lug and 12.4mm thick, with a two-piece octagonal bezel and a super-hard coating. It ships with the titanium bracelet and an additional black silicone strap in a special presentation box — and the quick-change system means swapping between them takes a button press.

At a Glance

• BrandSeiko
• CollectionAstron GPS Solar
• EditionLimited to 1,200 Pieces
• MovementCalibre 5X63 GPS Solar
• Case Size43.4mm
• DialCrystal Green, Faceted
• BezelTwo-Piece Octagonal Titanium
• Case MaterialTitanium (Super-Hard Coating)
• FunctionsDual Time + 24-Hour Chronograph
• Water Resistance100m (10 BAR)
• Supplied WithTitanium Bracelet + Silicone Strap
• Power ReserveApprox. 6 Months

Why You'll Love It

• Only 1,200 exist. This is a closed production run with a dial made for this edition alone — not a colour swap on a standing model.
• The Crystal Green dial is the reason to want this one. A newly developed pressed pattern of multiple facets, drawn from the way light breaks across a quartz crystal, in a green taken from green quartz itself.
• Two watches in one box. The titanium bracelet and an additional black silicone strap are both included, and the quick-change system swaps them at the press of a button — formal on metal, sport on silicone, no tools.
• 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.
• At 12.4mm, this is the slimmest case the Astron chronograph has worn, with a two-piece octagonal bezel designed to sit the weight low for better balance.
• 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.

Perfect For

• Limited Edition Collectors
• Frequent Flyers
• Business Travel
• Long-Duration Timing
• Green Dial Collectors
• Strap Swappers
• Titanium Wearers
• Milestone Gift for Him

Key Features

• Limited edition of 1,200 pieces worldwide — a closed production run, supplied in a special presentation box with an additional silicone strap.
• Crystal Green faceted dial — a newly developed pressed pattern of multiple facets inspired by the sparkling faces of a quartz crystal, in a green drawn from green quartz.
• 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.
• World time function covering 38 time zones, plus a perpetual calendar correct to the year 2100 and a power reserve indicator on the dial.
• Quick-change strap system — a button release on the case lets you swap between the supplied titanium bracelet and black silicone strap without tools.
• Titanium case and bracelet with super-hard coating — lighter than stainless steel, with a surface treatment that raises hardness against everyday scuffing.
• Two-piece octagonal titanium bezel — brushed on the top surface, polished down the faceted sides, and shaped to lower the centre of gravity for better balance on the wrist.
• Sapphire crystal with super-clear coating — the coating cuts reflections, and sapphire rates 9 on the Mohs hardness scale.
• LumiBrite on hands and markers, date and day-of-the-week displays, magnetic resistance of 4,800 A/m and 100-metre water resistance.

Technical Specifications

The Seiko Astron HAB005J1 is a 43.4mm GPS Solar dual-time chronograph powered by Calibre 5X63, limited to 1,200 pieces worldwide, with approximately six months of operation from a full charge and a power save mode of around two years. The case and bracelet are titanium with a super-hard coating, measuring 12.4mm thick and 50.0mm lug-to-lug, fitted with a two-piece octagonal titanium bezel and a quick-change strap system. It features a Crystal Green faceted dial with a newly developed pressed pattern, black sub-dials, sapphire crystal with super-clear coating, LumiBrite on hands and markers, a 24-hour chronograph in 1/20-second increments with split time, dual time on a 24-hour sub-dial, world time for 38 time zones, perpetual calendar to 2100, a power reserve indicator, date and day displays, an additional black silicone strap, and 100-metre water resistance.

Best Matched With

• Charcoal Suit
• White Linen Shirt
• Olive Field Jacket
• Cream Trousers
• Navy Knitwear
• Technical Outerwear
• Dark Denim

Frequently Asked Questions

Why Buy from City Chain Singapore

• Authorised Retailer 100% genuine Seiko product
• 3-Year Warranty Covered on every purchase
• Free Shipping All orders within Singapore
• Bracelet Adjustment Size it in-store