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IWC · Pilot

Strap for Pilot's Watch Chronograph Inspiration4

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

Lug width

21mm
21 mm strapsAll IWC
Lug width21 mm
Case diameter45 mm
ReferenceIW3891-10 (aka: IW389110)
FamilyPilot
MovementIWC caliber 69380 Hours, Minutes, Small seconds | Date, Day | Chronograph, Column wheel
Year2021
CaseTitanium, Ceramic

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 IW3891-10 (aka: IW389110)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Pilot IW3891-10 (aka: IW389110), seen from the bench

The IWC Pilot reference IW389110 is equipped with the 69380 caliber featuring column-wheel chronograph functions, small seconds, and day-date indication. The watch has 21mm lugs and an integrated chronograph mechanism with hours, minutes, and chronograph. The movement offers a day of the week display in addition to the traditional time functions.

Frequently asked questions

What is the lug width of the IWC Pilot IW3891-10?

The <a href="/pages/termine-glossario/misura-ansa">lug width</a> of the IWC Pilot Chronograph Top Gun IW3891-10 is 21 millimetres. This is a non-standard measurement that does not align with conventional widths (18mm, 20mm, 22mm), requiring targeted research for compatible straps. MilanoStraps maintains a dedicated catalogue of straps in various materials specifically sized for this specification.

What is the best strap to pair with the IWC Pilot IW3891-10?

For this avionic chronograph, selection depends on intended use: a deep brown <a href="/pages/termine-glossario/alligatore">alligator</a> strap emphasizes the military instrument character; thick calf leather with robust grain texture develops natural patina over time; a high-density nylon NATO maintains tactical identity without comfort compromise. The ceramic case requires chromatic contrast; avoid flat, neutral tones.

How do I change the strap on an IWC Pilot IW3891-10?

The IW3891-10 features standard spring bar lugs. Remove the bar using a dedicated tool or fine-tipped implement, gently extract the old strap, clean any debris from the lugs, position the new spring bar in the replacement strap, and thread the lug attachment on the left side before securing the right. For risk-free execution, Casati Milano offers professional strap change services.

Is a quality aftermarket strap compatible with the IWC Pilot IW3891-10?

Yes, provided it is manufactured to certified 21mm <a href="/pages/termine-glossario/misura-ansa">lug width</a> specifications. MilanoStraps delivers artisanal leather straps (alligator, <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a>, calf) and synthetic options specifically tailored to this width. Each strap may be customised in length, stitch colour, and initials, ensuring ergonomic fit to your wrist.

What is the typical lifespan of a leather strap for this model?

A premium leather strap (alligator, <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a>, <a href="/pages/termine-glossario/concia-vegetale">vegetable-tanned</a> leather) with routine maintenance (soft cloth cleaning, annual conditioning) sustains 3–5 years under moderate daily wear. Constant exposure to humidity, saline perspiration, and UV radiation shortens lifespan; storage in dry conditions extends it. MilanoStraps warrants 18 months on all straps, covering manufacturing defects.

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