Seiko · 5 Sports
Strap for Seiko 5 Sports SRPG39K1
The Seiko 5 Sports SRPG39K1 takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
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Lug width

Straps for the 5 Sports SRPG39K1
Selected for the 20 mm lug width · workshop selection
What length do I need?
Measure your wrist with a tailor's tape or a piece of string, comfortably snug.
| Wrist circumference | Length (long side / short side) |
|---|---|
| 15.0–16.4 cm | 120 / 70 mm |
| 16.5–17.8 cm | 125 / 75 mm |
| 17.9–19.0 cm | 130 / 80 mm |
| 19.1–20.3 cm | 135 / 85 mm |
| 20.4–21.6 cm | 140 / 85 mm |
| 21.7–22.9 cm | 145 / 90 mm |
The ready-to-wear strap is 115 × 75 mm. For a smaller or larger wrist I make it in the right length: order your length.
What I'm asked about the Seiko 5 Sports SRPG39K1
What strap size does the Seiko 5 Sports SRPG39K1 take?
The Seiko 5 Sports SRPG39K1 needs 20 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.
Can the strap on the Seiko 5 Sports SRPG39K1 be changed?
Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.
Can I put a leather strap on the Seiko 5 Sports SRPG39K1?
Yes, in 20 mm leather. On a case a calf strap works every day; if you want something more, alligator.
Which strap do you recommend for the Seiko 5 Sports SRPG39K1?
A 20 mm calf strap, for every day. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
More 5 Sports
More Seiko in 20 mm
- Seiko Prospex 300M-SPB455J1Prospex
- Seiko Presage HCB006JPresage
- Seiko Presage HCC009Presage HCC009
- Mechanical Alpinist Stainless Steel / Green / StrapMechanical
- Mechanical Stainless Stainless Steel / Black / BraceletMechanical
- Mechanical Stainless Stainless Steel / Silver / BraceletMechanical
For changing the strap
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only
The atelier's website: casatimilano.com





