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IWC · Pilot

Strap for Pilot's Watch Chronograph Ceramic / French / Strap

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
20 mm strapsAll IWC
Lug width20 mm
Case diameter39 mm
ReferenceIW3705-04 (aka: IW370504)
FamilyPilot
MovementIWC caliber 7922 hours, minutes, small seconds | date, day | Chronograph
Year1994 - 1998
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 Pilot IW3705-04 (aka: IW370504)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Pilot IW3705-04 (aka: IW370504), seen from the bench

The IWC Pilot reference IW370504 features the caliber 7922 with chronograph, hours, minutes, small seconds, date and day of the week functions. The watch has 20mm lugs and is part of the Swiss manufacturer's aviator collection. The movement offers complete indications for professional use in the aeronautical field.

Frequently asked questions

What is the lug width of the IWC Pilot IW3705-04?

The lug width of the IWC Pilot IW3705-04 is 20mm. This dimension is identical to historical Pilot models and allows you to pair the chronograph with straps specifically proportioned for slender to medium-slender wrists. To verify compatibility, measure the distance between the two inner lugs of the case with a ruler: it must be exactly 20mm.

What is the best strap for the IWC Pilot IW3705-04?

The best strap depends on your usage: for formal elegance, we recommend black or dark brown <a href="/pages/termine-glossario/alligatore">alligator</a> with matching stitching. For historical coherence, a NATO strap in ballistic nylon—Navy blue or dark grey—replicates the RAF Pilot colour code. For sportive practicality, a carbon rubber strap on stainless steel <a href="/pages/termine-glossario/deployante">deployante</a> reduces weight and offers dry grip. All materials should respect the ceramic's dark tonality.

How do I change the strap on my IWC Pilot IW3705-04?

Procure a remove pin tool (specific for spring bars) or a small-blade knife. Position the watch with the lugs facing upward. Insert the tool into the lug hole (usually the lower hole) and push gently upward to extract the pin. Repeat on the other side. Insert the new strap by aligning the lugs with the holes, then reinsert the pins ensuring they click into position. Avoid forcing: smooth movement indicates correct alignment.

Is an aftermarket strap compatible with the IWC Pilot IW3705-04?

Yes, provided it has a 20mm lug width. Premium artisanal straps—in <a href="/pages/termine-glossario/alligatore">alligator</a>, vegetable-tanned calf, or synthetic rubber—fit perfectly onto the case lugs. Verify that the strap has a thickness of 3.5–4mm: excessive thickness would cause difficulty in closing the deployante clasp.

How long does a leather strap last on the Pilot IW3705-04?

A premium <a href="/pages/termine-glossario/alligatore">alligator</a> or calf strap, subjected to moderate use and proper maintenance (regular cleaning, protection from moisture), offers a lifespan of 3–5 years. <a href="/pages/termine-glossario/concia-vegetale">Vegetable tanning</a> ages nobly: patina development is part of the strap's history. Factors that shorten lifespan: prolonged sun exposure, unwiped perspiration, repeated flexing along stitch lines. Rubber or NATO straps last 5–7 years thanks to material resilience.

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