Seiko · Prospex Divers
Strap for Seiko Prospex Divers SRPD21K1
The Prospex Diver Turtle Stainless Steel / Blue / Bracelet / Save the Ocean takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width

Straps for the Prospex Divers SRPD21K1
Selected for the 22 mm lug width · workshop selection
Blue Alligator and Rubber Hybrid Strap · rubber, for the water€138
Matte Olive Green Alligator and Rubber Hybrid Strap · rubber, for the water€138
Black Saffiano Rubber Strap€105
Black Calfskin NATO Strap€80
Grey Hammered Leather Strap with Ecru Stitching€98
Vintage Olive Green Calf Leather Watch Strap€80
What I'm asked about the Seiko Prospex Divers SRPD21K1
What strap size does the Seiko Prospex Divers SRPD21K1 take?
The Seiko Prospex Divers SRPD21K1 needs 22 mm between the lugs, usually 18 or 20 mm at the buckle. It's the size I've been fitting on it for years.
Can the strap on the Seiko Prospex Divers SRPD21K1 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 SRPD21K1?
Yes, in 22 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 45 mm diver I go for a full-thickness strap, not a thin one.
Which strap do you recommend for the Seiko Prospex Divers SRPD21K1?
Rubber if you wear it in the water; otherwise a 22 mm calf strap, full thickness. You'll find it ready in the 22 mm collection. If you'd rather have something built on your wrist, the Casati atelier.
More Prospex Divers
- Seiko Prospex Divers Marinemaster 300 Ninja Tuna22 mm
- Prospex Diver Trans Ocean Stainless Steel / Black / Bracelet20 mm
- Prospex Diver Trans Ocean Stainless Steel / Blue / Bracelet20 mm
- 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 22 mm
- Seiko Mechanical SKX007K1Mechanical
- Seiko SKX007 Black / Stainless Steel / RubberMechanical
- Seiko Mechanical SKX007K2Mechanical
- Seiko SKX007 Black / Stainless SteelMechanical
- Seiko SKX009 Black / Stainless SteelMechanical
- Seiko Prospex SNJ025 SNJ025Prospex SNJ025
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
