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IWC · Pilot

Strap for Pilot's Watch Spitfire Chronograph Stainless Steel / Silver / Bracelet

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

21mm
21 mm strapsAll IWC
Lug width21 mm
Case diameter42 mm
ReferenceIW3717-05 (aka: 3717-05, IW371705)
FamilyPilot
MovementIWC caliber 79320 Hours, Minutes, Small Seconds | Date, Day | Chronograph
CaseStainless 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 Pilot IW3717-05 (aka: 3717-05, IW371705)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Pilot IW3717-05 (aka: 3717-05, IW371705), seen from the bench

The Pilot IW371705 is equipped with the IWC caliber 79320 which offers hour, minute, small second, date, day and chronograph functions. The watch features 21mm lugs and maintains the distinctive design of the brand's aviator collection. The movement provides chronograph complications along with the complete date and day of the week display.

Frequently asked questions

What is the lug width of the IWC Pilot IW3717-05?

The IWC Pilot IW3717-05 features a 21-millimetre <a href="/pages/termine-glossario/misura-ansa">lug width</a>. This measurement represents the distance between the two lugs that secure the strap. It is essential to verify this specification before purchasing a replacement strap, as straps with 20mm or 22mm widths will not fit correctly on the case.

What is the best strap for the IWC Pilot IW3717-05?

The choice depends on intended use and aesthetic preference. For a formal look, <a href="/pages/termine-glossario/alligatore">alligator leather</a> is recommended, as it enhances the case's inherent elegance. For sporty-casual wear, vegetable-tanned leather with a <a href="/pages/termine-glossario/deployante">deployant clasp</a> offers comfort and practicality. Shell cordovan is ideal for those who appreciate the natural patina that develops over time.

How do I change the strap on the IWC Pilot IW3717-05?

The process is straightforward: obtain a spring bar tool. Insert the flat end of the tool between the case lug and the pin, gently lifting to release the internal spring mechanism. Extract the pin from the lug hole and repeat on the opposite side to remove the old strap. To install the new strap, position the pin through both lugs and press gently until it clicks into place. Always verify that the strap is secure before wearing.

Can I use an aftermarket strap on this model?

Yes, provided the <a href="/pages/termine-glossario/misura-ansa">lug width</a> is precisely 21mm. Quality artisanal straps are fully compatible with the IW3717-05 and frequently offer superior construction and finishing compared to OEM alternatives. Always select straps crafted from vegetable-tanned leather or <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> for optimal longevity.

How long does a leather strap last before replacement is necessary?

Lifespan varies according to material and usage patterns. A quality alligator strap with moderate daily wear typically lasts 3-5 years. Vegetable-tanned calf leather, being softer, wears more quickly (2-4 years). Shell cordovan, if properly maintained, can last 5-7 years or longer. Durability decreases with constant humidity exposure, perspiration, and thermal fluctuations. Storage in a dry environment and protection from moisture significantly extend strap longevity.

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