Seiko
Seiko SFJ003 Prospex Speedtimer Solar Chronograph Watch Stainless Steel Black
Stainless-steel solar chronograph measures 60 minutes in 1/100-second increments with split-time function and six-month power reserve
- TypeWatch Repair & Tools
- 1/100-second precision chronograph for exact timing
- Solar-powered 8A50 movement with six-month power reserve
- LumiBrite hands and markers ensure low-light readability
- Screw-down caseback and sapphire crystal protect the mechanism
- Tri-fold push-button clasp secures the bracelet quickly
Solar chronograph for adventure use
The Seiko SFJ003 Prospex Speedtimer is a solar-powered chronograph built for 1/100-second timing. It suits wearers who need precise elapsed-time measurement during sports or field work. The 8A50 movement runs on any light source and holds a 6-month power reserve when fully charged. No battery change is required.
Upgrade from basic quartz
This model replaces simple three-hand quartz watches or mechanical chronographs that lack solar charging and 1/100-second resolution. The jump is worth it when you need split-time function, 60-minute total elapsed capacity and a curved anti-reflective sapphire crystal for legibility. It also adds LumiBrite hands and markers for low-light reading.
Straightforward wrist fit with screwdown security
The stainless steel case uses a tri-fold push-button release clasp for quick on-off wear. A screwdown caseback seals the movement against water and dust. Concave hammer-shaped pushers make stopwatch actuation easy even with gloves. The only common issue is ensuring the clasp engages fully on first fastening.
Highlights
- 1/100-second precision chronograph for exact timing
- Solar-powered 8A50 movement with six-month power reserve
- LumiBrite hands and markers ensure low-light readability
- Screw-down caseback and sapphire crystal protect the mechanism
- Tri-fold push-button clasp secures the bracelet quickly
Specifications
| Brand | Seiko |
|---|---|
| Type | Watch Repair & Tools |
Questions about this item
What wrist size does the tri-fold push button release clasp on this watch fit?
The tri-fold push button release clasp adjusts to fit a range of wrist sizes; the micro-adjustment holes on the stainless steel bracelet allow you to fine-tune the fit without tools.
Which step do owners often miss when setting the 1/100 second solar chronograph for the first time?
Many forget to fully charge the solar cell under bright light until the power reserve indicator shows full before pulling the crown to set the time and chronograph hands.
What part will need replacement after several years of daily wear on the Seiko SFJ003?
The solar rechargeable cell inside the 8A50 movement typically lasts many years; when it finally holds less charge, a watchmaker can replace it during a routine service.
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