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Seiko · Prospex Divers

Strap for Seiko Prospex Divers SUN021P1

The Prospex Diver SUN021P1 Stainless Steel / Black takes 24 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

24mm
24 mm strapsAll Seiko
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Lug width24 mm
Case diameter48 mm
ReferenceSUN021P1
FamilyProspex Divers
MovementSeiko caliber 5M85 Additional 12 Hours Hand (adjustable), Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Standard spring bar · length 24 mm · Ø 1.8 mm double flange · industry standard, no brand part number

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Prospex Diver SUN021P1 Stainless Steel / Black — watch

Straps for the Prospex Divers SUN021P1

Selected for the 24 mm lug width · workshop selection

All 24 mm straps →

What I'm asked about the Seiko Prospex Divers SUN021P1

What strap size does the Seiko Prospex Divers SUN021P1 take?

The Seiko Prospex Divers SUN021P1 needs 24 mm between the lugs, usually 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 SUN021P1 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 SUN021P1?

Yes, in 24 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 48 mm diver I go for a full-thickness strap, not a thin one. I don't keep rubber ready in 24 mm: write to me and I'll make it.

Which strap do you recommend for the Seiko Prospex Divers SUN021P1?

Rubber if you wear it in the water; otherwise a 24 mm calf strap, full thickness. You'll find it ready in the 24 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

For changing the strap

Classic Strap and Bracelet Removal Tooltwo-tip spring bar tool→Milano Straps Premium Swiss Standard Watch Bucklestang buckle, steel or PVD→Leather Conditioner Milano Strapsnourishes and protects the strap→Casati Milano Rectangular Epsom Leather Travel Case — Brownfor the watch and spare straps→

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

Updated on · by Antonio Zichichi