Seiko Astron GPS Solar Speed of Light Limited Edition SSH185

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

Light travels at 299,792 kilometers per second — a speed so extraordinary that it bends our understanding of time itself. The Seiko Astron SSH185 captures that energy in a watch that looks like it's already moving. The dial features a new horizontal pattern with intermittent lines, evoking the visual sensation of light streaking at high speed — the same bold, dynamic design language as the SSH183, rendered in a strikingly different palette.

Light green accents punctuate the case and details throughout, delivering a fresh, futuristic aesthetic that feels both sporty and sophisticated. The two-toned titanium-and-white-ceramic construction gives this piece a distinctive identity within the Speed of Light series — the contrast of black hard-coated titanium against white ceramic creating a look that is unmistakably its own. Powered by the GPS Solar Caliber 5X83, it self-adjusts to atomic clock accuracy via satellite and runs for approximately 6 months on a full charge. The 43.4mm titanium case keeps it light and durable. Each piece is individually numbered. Only 1,200 pieces exist.

Precision at the speed of light. In a different light.

Specifications

• Case Diameter: 43.4mm | Thickness: 13.4mm | Lug-to-Lug: 49.5mm
• Case Material: Titanium with black super-hard coating | Ceramic/aluminum bezel
• Crystal: Dual-curved sapphire with super-clear coating
• Bracelet: Titanium with black super-hard coating + white ceramic | Lug Width: 14mm | Length: 190.0mm
• Dial: Horizontal speed-of-light pattern | Light green accents
• Water Resistance: 10 bar (100m)
• Magnetic Resistance: 4,800 A/m
• Movement: GPS Solar Caliber 5X83
• Precision: ±15 sec/month (without GPS signal)
• Power Reserve: Approx. 6 months (fully charged) | 2 years (power save)
• Functions: GPS time adjustment, world time (38 cities), dual-time, chronograph (12hr), perpetual calendar, day, power reserve indicator, DST, in-flight mode
• Weight: 123.0g
• Reference: SSH185

Additional Details

• Brand: Seiko | Collection: Astron
• Limited Edition: 1,200 pieces worldwide | Individual serial number on case back
• Nickel-free construction
• LumiBrite on hands and indexes
• Authorized DePaula Jewelers dealer