The Seiko Astron SSE121 is a 2017 limited-edition GPS Solar chronograph designed with Giugiaro Design. Its 8X82 caliber uses light power for GPS time and time-zone adjustment, while the case and dial details reinterpret a Seiko-Giugiaro chronograph from 1983. Seiko announced 3,000 pieces; its launch price and release schedule are historical, not evidence of current availability or value.
What is the Seiko Astron SSE121?
Announced by Seiko on April 4, 2017, the SSE121 is the Astron Giugiaro Design Limited Edition, a GPS Solar chronograph fitted with Seiko’s 8X82 caliber. Seiko announced production of 3,000 pieces. The German-market reference is SSE121J1; regional reference suffixes can vary, while SSE121 identifies the model discussed here. Seiko’s general announcement and German release describe the launch.
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How does the 8X82 GPS Solar movement work?
The 8X82 uses light power for GPS-controlled time and time-zone adjustment. Seiko says local time can be adjusted anywhere in the world at the touch of a button. It also cautions: “If there are changes in the region / time zone, manual time zone selection may be required.” This means GPS functionality should not be read as a guarantee that the watch will always infer the correct local time zone automatically.
Timekeeping and chronograph functions
- Chronograph timing up to six hours, in one-fifth-second increments.
- Perpetual calendar specified through 2100.
- Signal-reception-result indication, daylight-saving-time function, and power-save function.
- World time: Seiko’s general announcement lists 40 time zones; its German regional release lists 39. The published specifications therefore differ by source and market.
Seiko states accuracy of ±15 seconds per month without GPS reception, at temperatures from 5°C to 35°C. That is the manufacturer’s stated condition-specific figure, not a claim about accuracy while GPS reception is active or under all temperatures.
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Why does the design reference a 1983 chronograph?
The SSE121 revisits a Seiko quartz chronograph designed with Giugiaro Design in 1983 for motorsport. The original’s offset case was intended to make the chronograph buttons accessible while riding. The 2017 Astron carries the collaboration forward through an aerodynamic, sporty case, black, red, and green accents, and distinctive hands and markers. Its case back uses a wheel motif around the individual serial number. Giugiaro Design also identifies the collaboration on its project page.
Case, materials, and dimensions
| Specification | Seiko-published detail |
|---|---|
| Case and bracelet | Titanium with super-hard black coating |
| Bezel and crystal | Ceramic bezel; sapphire crystal with super-clear coating |
| Diameter and thickness | 46.3 mm diameter; 13.3 mm thick |
| Water resistance | 10 bar |
| Magnetic resistance | 4,800 A/m |
| Clasp | Three-fold clasp with push-button release |
| Additional German-release details | LumiBrite; screw case back with Giugiaro Design logo |
What did it cost, and is it available now?
Seiko’s 2017 announcement gave an approximate recommended European retail price of €3,250 and said the watch would be released in selected markets from July 2017; the German release specified a July introduction for the SSE121J1. Those are launch-era details, not a current price guide or confirmation that the watch is available. No current stock, marketplace listing, or resale valuation is established here.
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For a second-hand example, check that the reference matches the SSE121 or the relevant regional suffix, verify the serial number and condition, and confirm whether the bracelet has its full set of links. Ask for service history as well; no service-cost figure is established here.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where can owners find operating instructions?
Seiko’s customer-service instruction index lists an English complete user guide and a handy manual for the 8X82 GPS Solar Astron caliber. Consult the manual for model operation rather than assuming all GPS watch procedures are identical.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
