Seiko · Prospex Divers

Strap for Prospex Diver Turtle Stainless Steel / Black / Black Series

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

Lug width22 mm
Case diameter45 mm
ReferenceSRPC49 (aka: SRPC49K1)
FamilyProspex Divers
MovementSeiko caliber 4R36 hours, minutes, seconds | date, day
Year2017
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 Prospex Divers SRPC49 (aka: SRPC49K1)

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Prospex Divers SRPC49 (aka: SRPC49K1), seen from the bench

The Seiko Prospex SRPC49K1 (Blue Lagoon) represents the contemporary evolution of Japanese diving heritage. Housed in a 45mm stainless steel 316L case with unidirectional rotating bezel, it delivers 300 meters water resistance through precise construction geometry. The Seiko Caliber 4R36 automatic movement maintains ±15 seconds daily accuracy, while the domed mineral crystal, applied indices, and luminous hands ensure readability in low light. The 22mm lug width balances proportionally with the case diameter, a standard shared across professional dive watches.

Frequently asked questions

What is the lug width of the Seiko Prospex Divers SRPC49?

The Seiko Prospex SRPC49 features a 22mm lug width. This dimension was deliberately chosen to maintain optimal proportions with the 45mm case and to deliver both visual and tactile solidity. All 22mm straps are compatible with this model, from leather variants to rubber or NATO textile options.

What is the best strap for the Prospex SRPC49?

The choice depends on usage and aesthetic preferences. For regular diving, an FKM rubber strap ensures chemical resistance and rapid drying. For everyday elegance, a vegetable-tanned Tuscan leather strap offers natural patina and colour warmth. For versatility, NATO in marine tones is unbeatable. For formal occasions, black or dark brown alligator elevates the timepiece towards black-tie events.

How do I change the strap on my Seiko Prospex SRPC49?

The Prospex SRPC49 uses standard 22mm spring bars. Obtain a spring bar tool. Insert the tool under the spring bar on one side, push gently downward to release the pin, then withdraw the old strap. Reverse the process to install the new strap, ensuring the springs are properly positioned and the pins enter the lug holes evenly.

Is an aftermarket strap compatible with the SRPC49 as robust as the original Seiko?

It depends on the quality of the aftermarket strap. High-grade vegetable-tanned leather straps often exceed the durability of originals, thanks to slower tanning processes and more robust finishing. FKM rubber straps maintain resilience comparable to Seiko's. NATO in ballistic nylon guarantees exceptional longevity. The key is selecting specialised manufacturers and certified materials.

How long does a leather strap last on the Seiko Prospex SRPC49?

A well-maintained vegetable-tanned leather strap lasts 3–5 years with daily wear, before requiring replacement due to buckle wear or leather thinning. Exposure to saltwater accelerates deterioration; rinsing in fresh water and drying thoroughly extends service life. The patina forming over time adds character but does not compromise structure. Some collectors maintain leather straps beyond 7–8 years, though with reduced elasticity.

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