IWC
Pilot IW3713-19— lug 21mm

The lug width of the IWC Pilot IW3713-19 is 21mm. This specification determines strap compatibility: measuring precisely the distance between the two horizontal lugs on the case ensures the strap will fit without play and without forcing. The acceptable tolerance is between 20.8 and 21.2mm.

For the IWC Pilot, alligator leather represents the formal choice of excellence thanks to its uniform grain and visible ageing over time. Vegetable-tanned calf leather offers greater versatility and a patina that evolves parallel to the stainless steel case. For nautical or sporting use, NATO straps guarantee operational practicality. The choice depends on the intended use: formal, daily wear or recreational.

Strap replacement requires a spring bar tool or a small flathead screwdriver. Position the watch with the case facing downward, locate the pins that hold the lugs on the sides, slide the tool along the pin to free it from its seats. Remove the old strap and insert the new one until it clicks into place. The procedure requires care to avoid scratching the case.

Yes. Compatible aftermarket straps must respect the 21mm lug width and provide a total length suitable for the wrist. Milano Straps offers artisanal 21mm straps in various materials: alligator, calf, shell cordovan, with customisation options (colour, initials, buckle and deployante type). The Casati Milano atelier by appointment allows direct selection of leathers and bespoke construction.

A quality leather strap, with ordinary maintenance, lasts 5-7 years with daily use. Lifespan depends on: type of leather (alligator ages more slowly than calf), frequency of use, exposure to humidity and heat, maintenance (periodic cleaning, conditioning). Straps tanned with vegetable tanning develop attractive patina over time and can last beyond 7 years if properly stored.