Seiko
Seiko SFJ001 Prospex Speedtimer Solar Chronograph Watch
A solar chronograph measuring 60 minutes in 1/100-second increments with a six-month power reserve, sapphire crystal and screwdown caseback
- TypeWatch Repair & Tools
- 1/100-second chronograph precision for exact timing
- Solar-powered 6-month reserve eliminates battery changes
- LumiBrite hands and markers ensure low-light readability
- Sapphire crystal with anti-reflective coating resists scratches
- Screwdown caseback and tri-fold clasp secure the watch
Solar Chronograph for Adventure Seekers
The Seiko SFJ001 Prospex Speedtimer is a solar-powered chronograph watch built for people who treat daily life as an adventure. It uses the 8A50 movement to measure elapsed time up to 60 minutes in 1/100-second increments and includes a split time function. The white dial with four black subdials separates the main time display from the chronograph indicators for clear reading. LumiBrite hands and markers provide visibility in low light.
Easy Strap Adjustment and Crown Operation
The tri-fold push button release clasp allows the stainless steel bracelet to be opened and closed quickly without tools. Concave tops on the hammer-shaped pushers give a positive feel when starting, stopping or resetting the chronograph. The screwdown caseback and crown require a firm twist to seal properly; forgetting to screw them down fully is the most common reason for water ingress. The curved anti-reflective sapphire crystal resists scratches but can chip if struck sharply against hard surfaces.
Check Light Exposure and Wrist Fit Before Buying
The solar cell charges from any light source and delivers a 6-month power reserve when fully charged, so the watch must receive regular light to stay running. Buyers who keep the watch in a dark drawer for long periods will need to recharge it before use. The stainless steel case and bracelet add noticeable weight; try a similar size on your wrist to confirm comfort for all-day wear. Ensure you can operate the screwdown crown and pushers while wearing gloves if you plan to use the chronograph outdoors.
Highlights
- 1/100-second chronograph precision for exact timing
- Solar-powered 6-month reserve eliminates battery changes
- LumiBrite hands and markers ensure low-light readability
- Sapphire crystal with anti-reflective coating resists scratches
- Screwdown caseback and tri-fold clasp secure the watch
Specifications
| Brand | Seiko |
|---|---|
| Type | Watch Repair & Tools |
Questions about this item
How can I confirm the 1/100 second chronograph is running correctly after setting the time?
Start the chronograph and verify the centre seconds hand moves in distinct 1/100-second steps; the subdials should track elapsed minutes up to 60 and the split function must freeze the display while the movement continues.
What items are included with the watch and what must be purchased separately?
The watch comes on its stainless steel bracelet with the tri-fold push button release clasp already fitted; no additional straps, tools or charging accessories are included.
Which version of the Speedtimer solar chronograph should I choose?
Only the SFJ001 reference is offered, featuring the 8A50 solar movement, 1/100-second chronograph with 60-minute capacity, LumiBrite hands and markers, screwdown caseback and curved anti-reflective sapphire crystal.
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