IWC · Pilot

Strap for Pilot's Watch Mark XVIII Silver

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 diameter40 mm
ReferenceIW3270-12 (aka: IW327012)
FamilyPilot
MovementIWC caliber 35111 hours, minutes, seconds | date
Year2018 - 2022
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 IW3270-12 (aka: IW327012)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Pilot IW3270-12 (aka: IW327012), seen from the bench

The IWC Pilot's Watch Mark XVIII Silver IW3270-12 is a 40 mm stainless steel instrument watch powered by the IWC 35111 automatic calibre with bidirectional winding at 28,800 vph. It features a black antireflective dial, luminous tritium indices, and a date window, with 100 metres water resistance and a closed case back. The watch accommodates a 20 mm strap width, a fixed dimension determined by the lug attachment geometry and dial proportions of the Pilot lineage.

Frequently asked questions

What is the lug width of the IWC Pilot IW3270-12?

The lug width of the Pilot IW3270-12 is 20 millimetres. This dimension corresponds to the interval between the two internal lugs of the case and remains constant across all examples of this reference. A compatible strap must have precisely 20mm lug width to ensure a secure fit without play.

Which strap should I choose for the IWC Pilot IW3270-12?

The choice depends on use and context. Vegetable-tanned alligator or shell cordovan represent the pinnacle of elegance and durability. Calf leather offers a balance between robustness and workability. Vulcanized rubber strap is ideal for marine or sports environments. NATO, in nylon or fabric, evokes the original avionic vocation without sacrificing practicality.

How do I change the strap on the Pilot IW3270-12?

The strap is replaced using a spring bar tool (an implement with a bifurcated tip). Position the tip in the lateral holes of the lug, push downward to compress the internal spring, extract the metal bar, and remove the old strap. Repeat the operation with the new strap, verifying that the bar clicks into position. Do not force: if resistance is excessive, the tool is not correctly positioned.

Can I use an aftermarket strap with a lug width different from 20mm?

No. The lugs of the Pilot IW3270-12 accept exclusively straps with a lug width of 20 millimetres. A strap with 18mm or 22mm does not couple correctly: the holes do not coincide, and the risk of losing the watch increases. Always verify compatibility before purchase.

How long does a leather strap last on a daily-wear wristwatch?

A quality leather strap, subjected to regular daily use, maintains structural integrity for 18–36 months. Duration varies according to material: shell cordovan and vegetable-tanned alligator easily exceed two years; calf leather requires greater attention to moisture. Frequent exposure to sweat or water accelerates wear. A NATO strap lasts significantly longer, even beyond three years, thanks to the synthetic nature of the material.

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