SEIKO ASTRON SSH179J1 DUAL-TIME GPS SOLAR CHRONOGRAPH MEN WATCH

The Seiko Astron SSH179J1 is a GPS Solar dual-time chronograph in black super-hard coated titanium, built around Seiko's Calibre 5X83 — the first Astron movement to combine dual-time capability with a chronograph. It connects to the GPS satellite network automatically to set its own time and time zone anywhere in the world, and it draws every bit of that energy from light alone. No battery changes, no manual resetting after a long-haul flight.

The case measures 44.1mm across and 14.4mm thick, with a 50mm lug-to-lug span and an angular, integrated silhouette that runs unbroken from case to bracelet. Titanium keeps the whole watch to 110 grams, which is where the design earns its keep: this is a large, technical watch that sits far lighter on the wrist than its dimensions suggest. The black dial carries a vertical sub-dial layout beneath a dual-curved sapphire crystal with super-clear coating, and the titanium bezel is fitted with its own sapphire insert.

At a Glance

• BrandSeiko
• CollectionAstron GPS Solar
• MovementCalibre 5X83 GPS Solar
• Case Size44.1mm
• DialBlack
• Case FinishBlack Super-Hard Coated Titanium
• GlassDual-Curved Sapphire (Super-Clear Coating)
• FunctionsDual Time + Chronograph
• Water Resistance100m (10 BAR)
• BraceletIntegrated Titanium, Five-Row
• Weight110g
• Power ReserveApprox. 6 Months

Why You'll Love It

• It sets itself. The watch connects to the GPS network automatically to adjust time and time zone, so you land, and it is already right — no crown work, no counting hours forward.
• Light alone runs it. Solar charging gives approximately six months of operation from a full charge, with a power save mode that stretches to around two years. There is no battery to replace on a service schedule.
• Titanium at 110 grams. A 44.1mm case that wears with almost no weight behind it, which changes how a watch this size feels across a full day.
• The black super-hard coating gives the titanium a matte, technical darkness that separates this reference from the natural-finish models in the same family.
• Dual time and a chronograph in one movement — home time and local time readable at a glance, with a 12-hour stopwatch on top.
• Two sapphire surfaces: the dual-curved crystal over the dial and a second sapphire insert set into the titanium bezel.
• The perpetual calendar runs correctly to 28 February 2100, so the date and day never need correcting for short months or leap years.

Perfect For

• Frequent Flyers
• Business Travel
• Working Across Time Zones
• Titanium Wearers
• Technical Watch Collectors
• All-Black Styling
• Everyday Wear
• Milestone Gift for Him

Key Features

• Calibre 5X83 GPS Solar movement — receives signals from the GPS satellite network to adjust both time and time zone, with automatic connection attempts up to twice a day and a manual connection available at the push of a button. Accuracy is stated as ±15 seconds per month without a GPS signal, at temperatures between 5°C and 35°C.
• Dual-time function with AM/PM indication — a second time zone is carried on the sub-dial, and the time transfer function swaps main dial and sub-dial readings when you want to switch which one is "home".
• Chronograph up to 12 hours — measured in 1/20-second increments, with the 1/20-second counter at 12 o'clock and the 12-hour counter (hours and minutes) at 6 o'clock during chronograph operation.
• Black super-hard coated titanium case and bracelet — titanium keeps the total weight to 110 grams, and the super-hard coating raises surface hardness against everyday scuffing. The bezel is titanium with a sapphire crystal insert.
• Dual-curved sapphire crystal with super-clear coating — the coating cuts reflections, and sapphire rates 9 on the Mohs hardness scale.
• World time function covering 38 cities, plus daylight saving time adjustment, satellite acquisition status display, reception result display, and an in-flight mode that suspends GPS reception.
• Perpetual calendar to 28 February 2100 — date and day-of-the-week displays that adjust themselves for short months and leap years.
• Power reserve indicator and power save function — the dial shows remaining charge, and the movement parks itself to conserve energy when left in the dark, waking and correcting itself on exposure to light.
• LumiBrite on hands and indexes — Seiko's luminous compound charges under light and reads clearly in the dark without any external power draw.
• Easy-adjust three-fold clasp with push-button release — micro-adjustment on the clasp itself lets you fine-tune fit as your wrist changes through the day.
• Allergy-safe metal, screw case back, magnetic resistance of 4,800 A/m and 100-metre water resistance.

Technical Specifications

The Seiko Astron SSH179J1 is a 44.1mm GPS Solar dual-time chronograph powered by Calibre 5X83, with approximately six months of operation from a full charge and a power save mode of around two years. The case and five-row integrated bracelet are titanium with a black super-hard coating, measuring 14.4mm thick and 50.0mm lug-to-lug at a total weight of 110 grams. It features a black dial, a titanium bezel with sapphire crystal insert, dual-curved sapphire crystal with super-clear coating, LumiBrite on hands and indexes, a 12-hour chronograph in 1/20-second increments, dual-time with AM/PM indication, world time for 38 cities, perpetual calendar to 2100, a power reserve indicator, date and day displays, a screw case back, and 100-metre water resistance.

Best Matched With

• Charcoal Suit
• Black Field Jacket
• White Oxford Shirt
• Navy Overcoat
• Dark Denim
• Technical Outerwear
• Black Leather Trainers

Frequently Asked Questions

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