SEIKO Astron GPS Solar 145th Anniversary Limited Edition | SSH186

In celebration of Seiko’s 145th anniversary, a special limited-edition model tracing Seiko’s legacy is now available.

In 2026, Seiko will celebrate its 145th anniversary. Since its founding in 1881, the company has viewed watches as a potential solution to social challenges, consistently pursuing innovation while upholding founder Kintaro Hattori's philosophy to be “always one step ahead of the rest."

This new GPS Solar Dual-Time Chronograph celebrates Astron's spirit of innovation. Symbolizing success and prosperity, gold-colored accents grace every part of the watch, from the dial and bracelet to the case.

The bezel features a gold-colored sapphire crystal insert that adds depth and dimension. Even the gold-colored markings at 1, 4, and 5 on the UTC scale offer a subtle tribute to the 145th anniversary.

Specifications

Movement

• Caliber Number: 5X83
• Movement Type: GPS solar
• Precision: ±15 seconds per month (without receiving a GPS signal and at temperatures between 5°C and 35°C )
• Power reserve: Operating for approx. 6 months (when fully charged), power save: approx. 2 years
• Jewels: 14
• Functions:
  
  • Overcharge prevention function
    
  • Power save function
    
  • Chronograph up to 12 hours in 1/20 second increments
    
  • Perpetual calendar to the february 28, 2100
    
  • World time function (38 cities)
    
  • Dual-time function
    
  • Day display
    
  • Power reserve indicator
    
  • Time transfer function (Switching between the main-dial and sub-dial)
    
  • GPS signal reception function (Time zone adjustment, automatic time adjustment, manual time adjustment)
    
  • Satellite acquisition status display function
    
  • Reception result display function
    
  • DST (Daylight Saving Time)
    
  • Function to prevent the GPS signal reception (in-flight mode)
    
  • Automatic hand position alignment function
    

Case/Band

• Case Material: Titanium (super-hard coating)
  
• Case Size:
  
  • Thickness: 14.4mm
    
  • Diameter: 44.1mm
    
  • Lug-to-lug: 50.0mm
    
• Crystal: Dual-curved sapphire crystal
  
• Crystal Coating: Super-clear coating
  
• Clasp: Three-fold clasp with push button release
  
• Bracelet Length: 190.0
  
• Distance between lugs: 14

Other Details

• Water Resistance: 10 bar
  
• Magnetic Resistance: 4,800 A/m
  
• Features:
  
  • LIMITED EDITION on the case back
    
  • Serial number engraved on the case back
    
  • Against an allergic reaction to nickel
    
  • Clasp with Smart Adjuster function
    
  • Screw case back

Apparel Sizing Guide for Women and Men. 

For WOMEN:

This chart is based on body measurements. Each style will fit in a unique way. Check styling notes in the description of the styles you are interested in for more detail.

Please note:

All measurements should be taken under, not over clothing. Your inseam is the measurement from crotch to floor. If you take measurements in centimeters, be sure to convert them to inches (2.54 centimeters = 1 inch)

For MEN:

Unit: Inch

Men’s Body Measurements