Formex · Pilot

Strap for Pilot Automatic Chronograph Sandblasted / Carbon Fibre / Bracelet

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

Lug width22 mm
Case diameter47 mm
Reference1100.5.8129.110
FamilyPilot
MovementETA caliber 7750 Hours, Minutes, Small Seconds | Date, Day | Chronograph
CaseCarbon | Titanium, Stainless 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 1100.5.8129.110

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Pilot 1100.5.8129.110, seen from the bench

The Formex Pilot 1100.5.8129.110 is a professional chronograph with a 46.5mm case combining forged carbon and titanium with stainless steel. It features an ETA 7750 automatic movement with integrated chronograph, applied indices, central chronograph with small seconds totalizer, date and day display. The 22mm lug width ensures balanced proportions between case mass and strap compatibility, while the titanium-threaded crown and sapphire caseback allow observation of the movement.

Frequently asked questions

What is the exact lug width of the Formex Pilot 1100.5.8129.110?

The Formex Pilot 1100.5.8129.110 features a lug width of 22mm. This measurement is taken from the inner edge of the lug where it attaches to the case. Precision of ±0.5mm is critical to avoid lateral play or stress on the spring bars during daily wear.

Which strap is most suitable for the Formex Pilot 1100.5.8129.110?

The ideal strap depends on the intended use. For formal and professional environments, we recommend vegetable-tanned alligator or chrome-tanned calf leather. For tactical aviation use, a robust 3-stitch NATO strap offers practicality and readability. FKM rubber is the best choice in marine or extreme climatic conditions where body temperature regulation is critical.

How do you change the strap on the Formex Pilot 1100.5.8129.110?

The Formex Pilot uses standard 22mm spring bars. Using a spring bar tool or rounded implement, gently press the pin inward from the opposite end to release the lug from the case. Repeat on both sides. Insert the new strap by aligning the holes with the pins and press firmly until you hear a click. Verify both spring bars are correctly seated.

Does the Formex Pilot 1100.5.8129.110 accept compatible aftermarket straps?

Yes, absolutely. The 22mm lug width is a consolidated standard in the modern chronograph segment. Any high-quality strap with 22mm width is compatible: alligator, calf, shell cordovan, NATO, or rubber. Milano Straps offers a curated selection of handcrafted 22mm straps, ready for shipment or customisable upon request.

What is the estimated lifespan of a leather strap on the Formex Pilot 1100.5.8129.110?

A quality alligator or calf strap lasts 3-5 years with regular maintenance (cleaning and hydration every six months). Extended vegetable tanning prolongs overall durability due to the natural tannin resistance. Daily use in very humid or aggressive environments shortens service life. A cotton/polyester NATO strap resists up to 7-10 years if not exposed to extreme pulling force.

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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only