Seiko · Prospex Divers
Strap for Seiko Prospex Divers SPB153
The Prospex Diver 1970 Stainless Steel / Green takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
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- Ships in 1–3 working days
- Worldwide shipping
- 30-day returns
- 12-month warranty on manufacturing defects
- Hand-stitched in Milan
Lug width

Your watch with our straps









Calf, Orange
Grand Cavalier Leather Strap Orange
€120
★ 4.9 · 12
1 / 106
Real photos of the strap and the case. No generated images.
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 Prospex Divers SPB153
What strap size does the Seiko Prospex Divers SPB153 take?
The Seiko Prospex Divers SPB153 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 Prospex Divers SPB153 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 Prospex Divers SPB153?
Yes, in 20 mm leather, as long as you don't wear it in the water: leather doesn't like the sea or the pool. For days in the water, rubber. On a 43 mm diver I go for a full-thickness strap, not a thin one.
Which strap do you recommend for the Seiko Prospex Divers SPB153?
Rubber if you wear it in the water; otherwise a 20 mm calf strap, full thickness. You'll find it ready in the 20 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
More Prospex Divers
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- Prospex Diver Trans Ocean Stainless Steel / Black / Bracelet20 mm
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- Prospex Diver 1970 Scuba Helly Hansen20 mm
- Prospex Diver SBDX014G Titanium / Black22 mm
- Seiko Prospex Divers SBDX01720 mm
- Prospex Diver Marinemaster 300 Stainless Steel / Black / Bracelet20 mm
- Seiko Prospex Divers SLA017J119 mm
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
