Seiko SSH153J1

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Astron ‘Silvery night’ 5X GPS Solar Chronograph


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Astron was created from Seiko’s passion for innovation, and now, under the theme of ‘Solidity,’ a series of solar timepieces have been created for the future of innovation.

Within a super hard coated titanium case, under dual sapphire glass crystal is a bright ‘silvery night’ dial, with a vertical subdial layout – a first for Astron. This model has its own contemporary feel, with its sleek lines, slim profile, and compact, angular design. It has an almost seamless flow from the case, through the lugs and to the bracelet. Its black ceramic bezel that is also protected by a super-hard coating. This piece was designed to have a low centre of gravity, making it fit well on the wrist.

It features a new 5X83 solar-powered movement, that not only charges efficiently, but also features a one twentieth of a second chronograph function for measuring elapsed time. The subdial at 12 o’clock is for the chronograph feature, the subdial at 9 o’clock for setting modes, and the subdial at 6 o’clock for a dual-time feature.

Seiko Astron: the world’s first GPS solar watch – powered by light, automatically adjusted to your exact time through the latest satellite technology.

In the real watch, the caseback direction may differ from the photograph.


Accuracy: ±15 seconds per month (±1 second per day)
Calibre: 5X83
Movement Type: GPS Solar
Power Reserve: Operating for approx. 6 months (when fully charged), power save: approx. 2 years
Jewels: 14
Dial Colour: Silver
LumiBrite: Lumibrite on hands and indexes
Case Material: Titanium with ceramic/titanium bezel
Strap/Bracelet: Titanium
Clasp: Three-fold clasp with push button release
Case Diameter: 43.3mm
Case Thickness: 13.4mm
Case Length: 49.5mm
Lug Width: 14.0mm
Other Specifications
Water Resistance: 10 bar
Crystal Coating: Super-Clear Coating
Crystal Type: Dual-curved sapphire crystal
Other Specifications: Screw case back, Allergy-safe metal, Clasp with Smart Adjuster function
Watch Function: Automatic hand position alignment function, Chronograph up to 12 hours in 1/20 second increments, Day display, DST (Daylight Saving Time), Dual-time function, Function to prevent the GPS signal reception (in-flight mode), GPS signal reception function (Time zone adjustment, automatic time adjustment, manual time adjustment), Overcharge prevention function, Perpetual calendar to the february 28, 2100, Power reserve indicator, Power save function, Reception result display function, Satellite acquisition status display function, Time transfer function (Switching between the main-dial and sub-dial)
Magnetic Resistance: 4,800 A/m

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