Phone: Mon-Sat 9-6:00 PST | Store: Mon-Sat 10-5:30 PST
888-730-2221 or 650-347-2221

Our physical store on Burlingame Avenue is open again! For the time being, visiting Topper is by appointment only. Please call or text the store at 650-347-2221 to schedule your appointment from 11:30 - 5:00 PM Tuesday through Saturday. We look forward to seeing you!

Seiko Astron SSH021

Seiko Astron

SKU: SSH021 

  • $2,000.00
  • Seiko Authorized Dealer
  • Topper Guarantee
  • Extended Warranty more info



  • Stainless steel (super hard coating)
  • Case size: 42.7mm
  • Crystal: Dual-curved sapphire
  • Strap: Stainless steel bracelet 
  • Clasp: Three-fold clasp with push button release
  • Screw case back 


  • Caliber Number 5X53
  • Duration: Approx. 6 months when fully charged 
  • GPS Solar 
  • ±15 seconds per month (without receiving a GPS signal and at temperatures between 5°C and 35°C )


  • Magnified Date/Day calender
  • Stop seconds hand function
  • Water resistance: 100 meters
  • Lumibrite on hands and markers
  • Automatic hand position alignment function
  • Day display
  • DST (Daylight Saving Time)
  • Dual-time function
  • Function to prevent the gps signal reception function from working (in-flight mode)
  • GPS signal reception function (Time zone adjustment, automatic time adjustment)
  • Overcharge prevention function
  • Perpetual calendar to the February 28, 2100
  • Power reserve display
  • Power save function
  • Reception result display function
  • Satellite acquisition status display function
  • Time transfer function (Switching between the main-dial and sub-dial)
  • World time function (39 time zones)

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