IWC · Pilot

Strap for Pilot's Watch Chronograph Top Gun Woodland

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

Lug width

21mm
Lug width21 mm
Case diameter45 mm
ReferenceIW3891-06 (aka: IW389106)
FamilyPilot
MovementIWC caliber 69380 Hours, Minutes, Small Seconds | Date, Day | Chronograph, Column wheel
CaseCeramic, Ceratanium

Spring bar

Swiss Standard universal spring bars

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

Straps for the Pilot IW3891-06 (aka: IW389106)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Pilot IW3891-06 (aka: IW389106), seen from the bench

The IWC Pilot's Watch Chronograph Top Gun Woodland model IW3891-06 is a 44.50 mm chronograph with column-wheel mechanism, housed in Ceratanium—a proprietary titanium-ceramic alloy. It features the automatic IWC 69380 caliber with Breguet hairspring, offering ±5 seconds per day precision. The 21 mm lug width is engineered for optimal wrist ergonomics and cinturino compatibility.

Frequently asked questions

What is the lug width of the IWC Pilot IW3891-06?

The Pilot IW3891-06 features a lug width of 21 mm. This dimension is specific to the 44.50 mm case and is determined by the distance between the two lateral lugs. To verify strap compatibility, measure the gap between the lugs with a digital calliper, positioned perpendicular to the case.

What is the best strap for the IWC Pilot IW3891-06?

There is no universal choice, but specific materials for different functions. Structured alligator provides aesthetic contrast with the Ceratanium case; vegetable-tanned leather develops rich patina over time; shell cordovan guarantees density and natural lustre. For critical environments, technical fabrics (NATO) or rubber are more suitable. The choice depends on intended use: formal, daily or professional.

How do you change the strap on the IWC Pilot IW3891-06?

Use a spring bar tool to remove the elastic pins (springbars) that secure the strap to the lugs. Insert the tool into the small hole beneath each pin, applying gentle upward pressure to disengage the internal spring. Withdraw the used strap. To install the new one, align the pins with the lugs and push downwards until the spring engages. Verify that both pins are perfectly seated before wearing the watch.

Can I use an aftermarket 21mm strap on this Pilot?

Yes, provided the strap is fitted with standard elastic pins (diameter 1.50–1.80 mm) and the nominal width is genuinely 21 mm. We recommend straps constructed using artisanal techniques, where each lug is hand-finished to guarantee precise tolerances. Avoid low-end straps with approximate tolerances: the Pilot deserves construction quality on par with the case.

How long does a leather strap last on this model?

Durability depends on material and usage. Alligator or shell cordovan with vegetable tanning, subject to moderate daily use, maintains structural integrity for 8–12 years. Vegetable-tanned leather tends to develop physiological creasing after 5–7 years of constant contact with perspiration and humidity. Critical factors: relative humidity, cleaning frequency, direct sunlight exposure. Technical fabric straps last 10–15 years without significant aesthetic 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