Strap for Pilot's Watch Spitfire Chronograph Stainless Steel / Black / Italian / Bracelet

The lug width of the IWC Pilot IW3706-17 is exactly 20mm. This measurement represents the distance between the two pins that attach the strap to the case. It is a precise technical specification: straps dimensioned at 20mm adhere perfectly without gaps. To verify, measure the distance between the pins of your current strap using a digital calliper.

The ideal strap depends on your intended use. For formal elegance: black or dark brown alligator with vegetable tanning. For versatility: traditionally tanned calf with natural patina. For durability and water resistance: shell cordovan or satin FKM rubber. For sporty contexts: dark grey or beige NATO fabric. All must feature a 20mm lug width for compatibility.

Obtain a dedicated spring bar tool or consult a qualified watchmaker. Gently remove the current strap by extracting the pins from the lugs using the spring bar tool. Insert the new pins of your 20mm strap into the case lugs, ensuring that the pin ends click correctly into the holes. Check that the strap adheres symmetrically on both sides of the case.

Yes, 20mm aftermarket straps are fully compatible with the IW3706-17. Lug width is the mechanical compatibility standard. Always verify that your chosen strap is specified for 20mm and that the shoulder width at case level falls within tolerance. Artisanal quality straps guarantee superior longevity compared to OEM straps.

Lifespan depends on material, usage and maintenance. Vegetable-tanned alligator: 5-8 years of daily wear. Traditionally tanned calf: 4-6 years. Shell cordovan: 6-9 years thanks to intrinsic water resistance. Rubber and fabric: 3-4 years before visible wear. Regular maintenance—cleaning, drying, conditioning—significantly extends lifespan.