IWC
Pilot IW3706-05— lug 20mm

The lug width of the IW3706-05 is 20mm. This parameter represents the distance between the two pin anchoring points on the case lugs. It is a specific standard for this family of IWC chronographs, ensuring universal compatibility with all artisanal straps of the same dimension.

For a chronograph of this calibre, we recommend alligator leather in vegetable tanning for formal-to-casual versatility, or high-grain calf leather for daily dynamism. If the context is predominantly formal, shell cordovan (horse leather) delivers natural patina and structural density. For harsher applications, an organic cotton NATO retains the model's military heritage.

Strap replacement requires a spring bar tool. Locate the lower pin of one lug, apply lateral pressure with the tool to compress the internal spring, then slide the old strap outward. Repeat for both sides. Insert the new lugs into the freed pins, ensuring the spring mechanism clicks into place. Verify that the strap sits flush before wearing the watch.

Yes, provided the strap is constructed for 20mm lug width. Artisanal compatible straps guarantee consistent thickness, fluid passages, and durability comparable to originals. The aftermarket advantage lies in material choice freedom (alligator, cordovan, specialized calf) and customisation options (initials, custom stitching, natural dyes).

A quality leather strap, with proper maintenance, lasts 3–5 years in daily use, extending to 10–12 years with rotation and care. Longevity depends on material (shell cordovan easily exceeds 10 years; vegetable-tanned calf requires conditioning every 12–18 months) and exposure conditions (humidity, perspiration, UV accelerate ageing). The Casati Milano atelier offers 18-month warranty and restoration services.