Seiko Astron GPS Solar Speed of Light Limited Edition SSH183

The Speed of Light. Limited to 1,200 Pieces.

The Seiko Astron SSH183 is a limited edition that captures the near future through dynamic, high-energy design. The dial features a new horizontal pattern with intermittent lines, evoking the image of light traveling at high speed — a bold visual statement that sets this piece apart from anything in the standard lineup.

The two-layered bezel combines black ceramic components with a polygonal decorative edge, a construction exclusive to this limited edition. Neon orange accents punctuate the case, bracelet, and details throughout, delivering a sporty, high-contrast aesthetic that commands attention. Black ceramic runs through the bezel and the central row of the bracelet for a cohesive, striking look.

The easy-adjust clasp allows precise bracelet length fine-tuning without tools. Each piece is individually numbered with a serial number engraved on the case back, alongside the LIMITED EDITION designation.

Movement

• Caliber: 5X83
• Type: GPS Solar
• Precision: ±15 seconds/month (without GPS signal, 5°C–35°C)
• Power Reserve: Approx. 6 months operating (fully charged); approx. 2 years in power save mode
• Jewels: 14
• Functions: GPS time adjustment (auto & manual), World time (38 cities), Dual-time, Chronograph (12hr, 1/20s increments), Perpetual calendar (to Feb 28, 2100), Day display, Power reserve indicator, DST, In-flight mode, Time transfer, Satellite acquisition display, Auto hand alignment, Overcharge prevention, Power save

Case & Band

• Case Material: Titanium with super-hard coating; ceramic/aluminum bezel
• Diameter: 43.4mm
• Thickness: 13.4mm
• Lug-to-Lug: 49.5mm
• Lug Width: 14mm
• Bracelet Length: 190.0mm
• Crystal: Dual-curved sapphire with super-clear coating
• Clasp: Easy-adjust three-fold clasp with push button release
• Case Back: Screw case back with LIMITED EDITION engraving and individual serial number

Additional Specifications

• Water Resistance: 10 bar (100m)
• Magnetic Resistance: 4,800 A/m
• Weight: 123.0g
• LumiBrite: Hands and indexes
• Nickel-free: Designed to minimize allergic reactions