IWC · Pilot

Strap for Pilot's Watch Chronograph 41 Stainless Steel / Burgundy / Chinese New Year

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

Lug width

20mm
Lug width20 mm
Case diameter41 mm
ReferenceIW3881-07 (aka: IW388107)
FamilyPilot
MovementIWC caliber 69385 Hours, Minutes, Small Seconds | Date, Day | Chronograph, Column wheel
CaseStainless Steel

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 IW3881-07 (aka: IW388107)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Pilot IW3881-07 (aka: IW388107), seen from the bench

The IW388107 Pilot is equipped with the IWC caliber 69385, an automatic chronograph movement with a column-wheel. It offers hours, minutes, small seconds, date and day of the week indications, as well as a chronograph function. The watch features 20mm lugs for the strap.

Frequently asked questions

What is the exact lug width of the IWC Pilot IW3881-07?

The IWC Pilot IW3881-07 features a lug width of 20 millimetres. This is the internal distance between the lugs of the case where the strap is inserted. To verify strap compatibility, measure this distance with callipers; it must correspond exactly to 20mm.

What is the best strap material for the IWC3881-07?

This depends on intended usage. For formal contexts, alligator leather with vegetable tanning offers elegance and natural patina development over time. For daily wear, vegetable-tanned calf leather ensures durability and pleasant hand-feel. For extreme durability and sporty appearance, shell cordovan is unbeatable. For humid or nautical environments, vulcanised rubber or NATO fabric are functional choices without compromise.

How do I change the strap on my Pilot IWC3881-07?

Strap replacement is a straightforward operation. Use a spring bar tool (Y-shaped steel bar) to remove the lug pins from the case. Insert the fine tip of the spring bar tool into the lug hole, push the pin gently until it protrudes, then pull it out completely. Repeat for the other lug. Insert the new strap by aligning the holes with the pins, then reinsert the pins using the spring bar tool.

Can I use an aftermarket strap compatible with my IW3881-07?

Absolutely. Any artisanal strap with a 20mm lug width is compatible with the IWC Pilot IW3881-07. MilanoStraps offers a range of 20mm straps customisable in leather, colours, length, and details (initials, thread colour). Compatibility is guaranteed by the standard 20mm lug width, regardless of strap brand.

What is the average lifespan of a leather strap on an IWC Pilot?

A high-quality artisanal leather strap (vegetable-tanned alligator, calf, shell cordovan) typically lasts 3–5 years with daily wear and proper maintenance. Longevity depends on usage intensity, climatic conditions (humidity accelerates wear), and care applied. MilanoStraps straps are crafted from premium leathers and carry an 18-month warranty, but many customers wear them well beyond 5 years with simple periodic cleaning.

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