Seiko · 5 Sports

Strap for 5 Sports Suits Style Stainless Steel / Blue / Rubber

The 5 Sports Suits Style Stainless Steel / Blue / Rubber takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter43 mm
ReferenceSRPD71K2
Family5 Sports
MovementSeiko caliber 4R36 hours, minutes, seconds | date, day
Year2019
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the 5 Sports SRPD71K2

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The 5 Sports SRPD71K2, seen from the bench

The Seiko 5 Sports SRPD71K2 is a 42.5mm stainless steel diver watch representing modern evolution of Seiko's reliable tool watch philosophy from the 1960s. It features the automatic 4R36 caliber with manual winding, date and day functions, 21,600 vph frequency, and approximately 40-hour power reserve. The watch offers 100-meter water resistance, a high-contrast dial with luminescent indices, and a 22mm lug width that balances proportions and provides versatility in strap selection without sacrificing elegance.

Frequently asked questions

What is the lug width of the Seiko 5 Sports SRPD71K2?

The Seiko 5 Sports SRPD71K2 is fitted with a 22mm lug width. This measurement is determined by the distance between the two spring bars that secure the strap to the case. It is an intermediate size that provides access to an extensive catalogue of artisanal aftermarket straps, from Italian leather to vulcanised rubber, and woven NATO fabrics.

Which strap is best suited for the Seiko 5 Sports SRPD71K2?

The choice depends on intended use. For a formal-elegant pairing, we recommend a vegetable-tanned calf leather strap that develops patina over time. For a versatile sports style, a dense cotton NATO keeps the watch firmly on the wrist. A satin-finished alligator strap represents the compromise between refinement and the watch's inherent tool-watch nature.

How do I change the strap on my Seiko 5 Sports SRPD71K2?

To change the strap, you need to access the two spring bars located on either side of the case, where the strap is secured. Using a small removal tool (spring bar tool), gently lift the pin to disengage the strap from its seat. Insert the new 22mm strap by aligning it with the two pins and lower the spring until locked. The operation takes only minutes and requires no technical expertise.

Can I use an aftermarket-compatible strap on my SRPD71K2?

Yes, absolutely. The SRPD71K2 uses a standard 22mm lug width, compatible with virtually all commercial artisanal straps, including higher-quality hand-crafted models. An aftermarket strap in premium leather or technical rubber is not only completely compatible but often improves the overall ergonomics and aesthetics of the watch.

How long does a leather strap for the Seiko 5 Sports SRPD71K2 last?

Longevity depends on tanning quality and usage. A vegetable-tanned calf strap, under normal conditions (no prolonged immersion), retains structural integrity for 3–5 years. However, patina development is part of the beauty of vegetable leather: the strap ages and adapts to your wrist. A vulcanised rubber or woven NATO strap has theoretically superior longevity (5–8 years), being less subject to biological degradation.

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

The atelier's website: casatimilano.com