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IWC · Pilot

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

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
ReferenceIW3713-43 (aka: 3713-43, IW371343)
FamilyPilot
MovementIWC caliber 79230 hours, minutes, small seconds | date, day | Chronograph, Rattrapante
Year2003 - 2005
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 IW3713-43 (aka: 3713-43, IW371343)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Pilot IW3713-43 (aka: 3713-43, IW371343), seen from the bench

The Pilot's Watch Spitfire Double Chronograph IW3713-43 represents the contemporary evolution of IWC's legendary Pilot family, founded in 1936 to equip German fighter aircraft. This stainless steel model features a 42mm diameter case and houses the automatic IWC caliber 79230, a COSC-certified movement with split-seconds chronograph complication. The 21mm lug width maintains balanced optical proportions between the case diameter and strap attachment, while the sapphire crystal, 16mm thickness, and unidirectional rotating bezel define its functional design language rooted in instrument-watch heritage.

Frequently asked questions

What is the exact lug width of the IWC Pilot IW3713-43?

The lug width of the IW3713-43 is precisely 21mm. Measure internally between the two suspension pins using a digital calliper for accuracy. This dimension ensures complete compatibility with all 21mm straps from MilanoStraps.

What is the best strap material for the Pilot IW3713-43?

Alligator remains the optimal choice: the natural grain and developing patina respect the aviatory semantics of the model. Alternatively, French Taurillon calf leather with vegetable tanning offers robust construction and predictable texture. For daily sport use, NATO straps in cotton or synthetic canvas provide practicality without aesthetic compromise.

How do I change the strap on my IWC Pilot IW3713-43?

Remove the spring bars (elastic pins) using a spring bar tool, positioning the lever in the lateral slot of the lug and pushing gently inward. Once extracted from the old strap, insert the pins into the new strap, aligning them perfectly inside the lug and verifying the lock. This operation takes approximately five minutes and requires only a spring bar tool.

Can I use an aftermarket strap on a certified IW3713-43?

Yes, completely. The IW3713-43 employs standard 21mm suspension pins. Any high-quality strap constructed to 21mm specification fits perfectly. MilanoStraps produces 21mm straps customisable in leather, colour, and length, maintaining the same construction precision as original IWC straps.

How long does authentic leather last on a Pilot IW3713-43?

A strap in alligator or calf leather submitted to vegetable tanning resists 4–6 years with daily use, developing a natural patina that increases the aesthetic value of the watch. Longevity depends on solar exposure, humidity, and frequency of use. MilanoStraps provides 18-month warranty on all artisanal straps, with restoration and controlled ageing available at Atelier Casati Milano.

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