Strap for Big Crown ProPilot Timer GMT Stainless Steel / Black / Leather

The lug width is 22 millimetres. It is measured by calculating the internal space between the two metal lugs of the case (the pins that secure the strap). This measurement is crucial for mechanical compatibility and must be verified before purchasing an aftermarket strap.

It depends on usage: for formal contexts, alligator with vegetable tanning; for daily wear, soft calf with natural patina that evolves over time; for true instrument work, vulcanised rubber with reliable grip even with wet hands; for versatility, premium NATO in durable textile. Each choice reflects the watch's aeronautical heritage.

Position the watch on a stable surface with the case facing upward from below. Locate the two lateral metal pins holding the strap. Using a spring bar tool (professional tool costing 2-3 euros), gently push one of the pins inward to release the old strap. Repeat on the other side. For installation, align the ends of the new strap to the lug spaces (22mm apart) and insert the pins with the same tool, ensuring they lock completely.

Yes, provided the strap is compatible with the 22mm lug width. Always verify that the strap is designed for this specific width: undersized straps create dangerous play, oversized straps will not fit in the case. Specialised suppliers like Milano Straps offer 22mm straps tested for mechanical and aesthetic compatibility.

A quality calf or alligator strap, vegetable-tanned, typically lasts 3-5 years with intensive daily use, accounting for exposure to perspiration, moisture and temperature fluctuations. Lifespan extends to 7-10 years if use is occasional. The patina that forms naturally is not deterioration, but an aesthetic characteristic that increases the watch's value over time. Regular maintenance (cleaning, drying, conditioning every 6 months) significantly extends strap life.