IWC · Pilot

Strap for Pilot's Watch Chronograph Top Gun Lake Tahoe

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
ReferenceIW3891-05 (aka: IW389105)
FamilyPilot
MovementIWC caliber 69380 hours, minutes, small seconds | date, day | Chronograph, column wheel
Year2022
CaseTitanium, Ceramic

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 IW3891-05 (aka: IW389105)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Pilot IW3891-05 (aka: IW389105), seen from the bench

The IWC Pilot ref. IW389105 is equipped with the automatic caliber 69380 featuring chronograph, date, and day of the week functions. The movement includes a column-wheel for the chronograph control and displays hours, minutes, and small seconds. The watch has 21mm lugs for the strap.

Frequently asked questions

What is the correct lug width for the IWC Pilot IW3891-05?

The lug width is 21 mm. This measurement is critical for strap compatibility. A 1 mm error renders the strap unusable. To verify with precision, measure with a digital calliper the distance between the centres of the two metal pins of the lugs. If you lack proper tools, consult an authorised dealer for professional measurement.

Which strap material pairs best with the IWC Pilot IW3891-05?

Alligator leather with vegetable tanning represents the optimal choice for this chronograph. Natural colour or dark brown harmonises with the titanium case and ceramic bezel. Italian vegetable-tanned calf is the contemporary alternative, whilst shell cordovan is inadvisable as its lustre contrasts with the sober, instrumental aesthetic of this model.

How do you change the strap on the IWC Pilot IW3891-05?

The strap is changed by removing the lug pins using appropriate tools (quick-change pins or dedicated screwdrivers). Position the watch on a soft support to avoid scratches. Extract the pin from the first lug, slide off the old strap, then insert the new one. Reinsert the pin with even pressure until completely secure. If inexperienced, a professional strap specialist completes the operation in minutes without risk.

Is an aftermarket strap compatible with the IWC Pilot IW3891-05?

Yes, provided the lug width is precisely 21 mm. High-quality artisanal straps offer absolute compatibility and frequently exceed the construction standard of factory straps. Always verify the technical specifications from the seller before purchase and choose manufacturers who guarantee quality control on finishing and stitch resistance.

How long does a natural leather strap last on the IWC Pilot IW3891-05?

A high-quality natural leather strap (alligator, calf, shell cordovan) lasts between 3 and 7 years in daily wear, depending on frequency, climate conditions and care. Vegetable-tanned leather develops authentic patina within 6–12 months, then stabilises. Periodic maintenance (gentle cleaning, conditioning with natural oils) significantly extends durability. Italian artisanal straps, thanks to premium materials and hand construction, frequently exceed 5 years even under intensive use.

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