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Formex · Pilot

Strap for Pilot Automatic Chronograph Black / Calf

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

22mm
22 mm strapsAll Formex
Lug width22 mm
Case diameter47 mm
Reference1100.1.8020.213
FamilyPilot
MovementETA caliber 7750 Hours, Minutes, Small Seconds | Date, Day | Chronograph
CaseTitanium, Stainless Steel

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 1100.1.8020.213

Selected for the 22 mm lug width · workshop selection

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The Pilot 1100.1.8020.213, seen from the bench

The Formex Pilot Automatic Chronograph 1100.1.8020.213 represents a contemporary evolution of aeronautical heritage dating back to the 1970s. The 46.5 mm case combines stainless steel and titanium, paired with an ETA caliber 7750 chronograph movement. This instrument-watch houses hours, minutes, small seconds, date and day complications, designed for pilot cabins with essential functionality and high-contrast luminescent markers.

Frequently asked questions

What is the lug width of the Formex Pilot 1100.1.8020.213?

The <a href="https://milanostraps.it/pages/termine-glossario/misura-ansa">lug width</a> of the Formex Pilot 1100.1.8020.213 is 22 millimetres. This dimension is compatible with all straps designated for <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-22mm">22mm lugs</a>. Always verify that the new strap's terminal ends fit snugly against the lug without play.

Which strap is best suited for the Formex Pilot 1100.1.8020.213?

For a chronograph of this size and aviation-focused design, we recommend robust leather with <a href="https://milanostraps.it/pages/termine-glossario/concia-vegetale">vegetable tanning</a> (Tuscan, Horween) or textile NATO straps. Leather develops patina over time, acquiring character; NATO offers practicality and tactical versatility. In summer, vulcanised rubber or performance synthetics provide grip in perspiration or humid conditions.

How do I change the strap on the Formex Pilot 1100.1.8020.213?

Unscrew the lug bars from inside the lug assembly, removing the existing strap. Once the spaces are clear, insert the new strap by aligning the terminal holes with the bars. Hand-screw the bars until you feel slight resistance—do not force, as this risks movement damage. A dedicated spring bar removal tool makes the process more precise and safer.

What is the aftermarket strap compatibility with the Formex Pilot 1100.1.8020.213?

Any strap with a <a href="https://milanostraps.it/pages/termine-glossario/misura-ansa">lug width</a> of 22mm is compatible with the 1100.1.8020.213. This includes leather, textile, rubber, <a href="https://milanostraps.it/pages/termine-glossario/alligatore">alligator</a>, <a href="https://milanostraps.it/pages/termine-glossario/shell-cordovan">shell cordovan</a>, and specialised straps with <a href="https://milanostraps.it/pages/termine-glossario/deployante">deployante</a> clasps. The key is selecting straps proportioned for 46+ mm cases to maintain visual balance.

How long does a leather strap last on the Formex Pilot 1100.1.8020.213?

A quality leather strap (Tuscan, Horween, alligator) under daily wear on a 46.5mm chronograph maintains functionality for 3–5 years. Longevity depends on frequency of wear, climate conditions, and maintenance: protect from excessive moisture, apply protective balm every 6–12 months. Vegetable-tanned leather develops desirable patina and can be restored through gentle abrasion.

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