IWC
Pilot IW3713-29 (aka: IW371329)— lug 21mm

The lug width of the IWC Pilot IW3713-29 is 21mm. This measurement represents the distance between the inner lugs and is specific to this generation of Pilot. Accurate measurement is critical: position the digital calliper between the internal shoulders, not between the outer edges of the case.

The ideal choice depends on usage and context. For a dressy profile, <a href="/pages/termine-glossario/alligatore">alligator</a> leather in caramel brown or deep black offers understated elegance. If you seek character and temporal patina, <a href="/pages/termine-glossario/concia-vegetale">vegetable tanned</a> calf develops a second skin over time. NATO straps in ballistic nylon maintain the Pilot's military heritage with tactical versatility. FKM rubber is the superior technical choice for humid climates or environments where perspiration is problematic.

Strap replacement requires a spring bar remover tool (fork-shaped instrument). Unscrew the crown slightly, then insert the remover beneath the spring bar on the lug. Apply gentle pressure to compress the internal spring until the bar releases. Once extracted, slide off the old strap and insert the new one, ensuring the spring bar engages correctly in both lug holes. Verify the strap sits symmetrically on the case before final assembly.

All straps with a 21mm lug width are compatible. On milanostraps.it you will find a curated selection of handcrafted 21mm straps in alligator, calf, vegetable-tanned leather, fabric and rubber. Each strap is crafted on request and customisable in length, initials and stitching thread. For a complete bespoke experience, Casati Milano creates made-to-measure straps with personalised consultation and 18-month guarantee.

Durability varies based on material, usage and climate conditions. A quality <a href="/pages/termine-glossario/alligatore">alligator</a> strap, with moderate daily wear, resists 4-6 years before visible wear. A vegetable-tanned calf lasts 3-4 years with intensive use, but develops fascinating patina. FKM rubber achieves superior longevity (6-8 years), whilst NATO fabric straps exceed 10 years with minimal maintenance. Avoid prolonged exposure to moisture and direct heat, which accelerate fibre deterioration.