Seiko Prospex Speedtimer SPB517J1 Datsun 240Z Limited Edition
Want a numbered Speedtimer tied to Seiko’s 1971 East African Safari Rally support of the Datsun 240Z? The SPB517J1 is limited to 2,500 pieces. Matte black dial, red seconds, DATSUN at 6 o’clock, and dashboard-inspired numerals on an inner countdown ring. Caliber 6R55 automatic, about 72 hours of reserve, 39.5 mm by 12 mm, 200 metres, curved sapphire.
This is the slimmest 6R Prospex case Seiko used for the Datsun trio. A second crown at 4 o’clock turns the inner countdown for staging, pits, or event timing. The strap is LWG-sourced leather with a punch pattern and a tri-fold clasp. The screw case back carries LIMITED EDITION, a serial, and the Datsun mark. It is a motorsport homage with diver-level water resistance, not a 300 m Sumo.
Why collectors look at the SPB517J1
Production is capped at 2,500. The 6R55 three-day reserve is a step up from older 6R15 pieces. 39.5 mm and 44.5 mm lug-to-lug wear smaller than a Sumo. Super-hard coating on the steel helps the finish. Chronospride inspects authentic stock before dispatch.
- Movement: Seiko 6R55 automatic, manual wind, hacking, 24 jewels, about 72 hours
- Accuracy: +25 to −15 seconds per day (Seiko spec)
- Case: 39.5 mm diameter, 12.0 mm thick, 44.5 mm lug-to-lug, 20 mm lugs
- Crystal: curved sapphire, inner AR
- Water resistance: 200 metres (20 bar)
- Strap: cow leather, tri-fold clasp
- Limited edition: 2,500, serial on case back
- Weight: about 86 g
Frequently asked questions
How many SPB517J1 watches were made?
2,500 numbered pieces worldwide. The case back is marked LIMITED EDITION with the serial.
What movement is in the SPB517J1?
Caliber 6R55: automatic with manual winding, hacking seconds, about 72 hours of reserve, 24 jewels.
Is the SPB517J1 a dive watch?
It has 200 m water resistance, a screw case back, and a screw-down crown. The inner ring is a countdown, not a unidirectional elapsed-time dive bezel. Treat it as a 200 m sports watch with rally design.
What size is the SPB517J1?
Seiko lists 39.5 mm diameter, 12.0 mm thickness, 44.5 mm lug-to-lug, 20 mm lug width.
Does it come on a bracelet?
No. It ships on a leather rally strap. Lug width is 20 mm if you change straps.
Where can I buy the SPB517J1 in Australia?
Chronospride lists authentic stock, inspected before dispatch, with Australia-wide shipping on eligible orders.
The SPB517J1 is for collectors who want the Datsun 240Z Speedtimer with three-day reserve in a 39.5 mm case—not a daily 45 mm Sumo.
Buying this watch in Australia
Chronospride lists authentic stock and inspects each watch before dispatch. Eligible orders ship free Australia-wide. Covered by Chronospride’s 12 months warranty, handled by our team. Read the authenticity and warranty terms before you buy. If you need a different strap width or case size, use the specs above and our shop-by-size filters rather than guessing from photos alone.
Authentic stock, inspected before dispatch. Free shipping Australia-wide on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page.
| Case-Size | 39.5mm |
|---|---|
| Band-Width | 20mm |
| Lug-Width | 20mm |
| Lug to lug size | 44.5mm |
| Case Thickness | 12mm |