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Seiko · Prospex Divers

Strap for Prospex Diver SRPA79K1 Stainless Steel / Black

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

22mm
22 mm strapsAll Seiko
Lug width22 mm
Case diameter52 mm
ReferenceSRPA79K1
FamilyProspex Divers
MovementSeiko caliber 4R36 hours, minutes, seconds | date, day
CaseCeramic, Stainless Steel

Spring bar

Swiss Standard universal spring bars

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

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Straps for the Prospex Divers SRPA79K1

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Prospex Divers SRPA79K1, seen from the bench

The Seiko Prospex Diver SRPA79K1 is a professional tool watch with a 51.70mm stainless steel and high-tech ceramic case, ISO 6425 certified for diving to 300 meters. It features the Seiko 4R36 caliber automatic movement with day-date, a unidirectional ceramic bezel, and an anti-reflective sapphire crystal. The 22mm lug width proportionally balances the case diameter and suits NATO straps and quick-change applications.

Frequently asked questions

What is the lug width of the Seiko Prospex Divers SRPA79K1?

The SRPA79K1 is fitted with 22mm lugs, a consolidated standard for professional diving watches. This lug width provides ideal proportionality to the 51.70mm case diameter, enabling quick strap changes and compatibility with robust buckles and NATO straps of adequate thickness.

Which strap do you recommend for the Seiko Prospex Divers SRPA79K1?

It depends on intended use: an alligator strap with vegetable tanning combines elegance and robustness for mixed wear; a canvas or nylon NATO amplifies the tool watch character and offers chromatic versatility; an FKM rubber strap ensures absolute waterproofness for repeated diving. The choice dialogues with the ceramic and steel case—it is not purely aesthetic.

How do you change the strap on the SRPA79K1?

The SRPA79K1 is equipped with removable spring bar lugs. Remove the original strap using a dedicated spring bar remover or flat-tip knife, lifting slightly from below to release the spring. Align the new strap holes, press until the click, and verify the fit.

Is there an aftermarket strap compatible with the SRPA79K1?

Yes, any strap with 22mm lug width is compatible with the SRPA79K1. Milano Straps offers a dedicated collection in vegetable-tanned leather, alligator, NATO, and rubber, all tested and ready to ship. Each strap is packaged with assembly instructions.

How long does a leather strap last on the Seiko Prospex Divers?

A quality leather strap with vegetable tanning maintains structure and flexibility for 3–5 years of daily wear, developing a noble patina. Repeated saltwater exposure reduces lifespan to 18–24 months; in this case, FKM rubber is recommended. Regular maintenance with neutral creams significantly extends strap life.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only