Strap for Pilot's Watch Chronograph Stainless Steel / Black / Spanish / Strap

The lug width of the IWC Pilot IW3706-09 is 20mm. This is the distance between the two lugs of the case at the spring bar attachment points. You can verify this by placing a digital calliper between the inside of the two lugs: the value must be exactly 20mm. Any compatible strap for this watch must have a 20mm lug width.

The ideal strap depends on your usage and aesthetic preferences. For maximum sophistication, we recommend Mississippiensis alligator with natural grain and evolving patina. For intensive daily wear, vegetable-tanned calf leather offers superior durability and that raw grain that evokes aviation heritage. Japanese shell cordovan introduces unique chromatic depth with cognac patina development. For pure aviator aesthetics, ballistic nylon NATO is the ultimate functionalist choice. Vulcanised rubber bridges formality and technical use.

Changing the strap on your IW3706-09 requires a spring bar tool. Follow these steps: 1) Position the watch on a soft surface, protecting the case; 2) Use a spring bar tool to gently push the small metal cylinder (spring bar) towards the inside of the case; 3) Extract the pin from the lug: the strap will separate easily; 4) Repeat on the other lug. For installation, align the new strap with the holes and snap the spring bars until you hear a definitive click. If you are uncertain, consult a professional watchmaker.

The IW3706-09 accepts all straps with 20mm lug width. Compatible aftermarket straps include: artisanal leather straps (alligator, cordovan, calf, suede), ballistic nylon NATO straps, vulcanised rubber straps, textile straps, and nubuck leather straps. Online you will find a wide selection of 20mm straps ready for dispatch, customisable in colour, initials and stitching thread. Always verify that the strap is specifically dimensioned for your lug width: an incorrect size will not fit on the case.

The lifespan of a leather strap depends on the material, usage and maintenance. Quality alligator, worn daily, can last 3-5 years before requiring leather regeneration and spring bar replacement. Shell cordovan, thanks to its density, can exceed 5-7 years. Vegetable-tanned calf, more subject to environmental factors, has an estimated lifespan of 2-4 years if frequently exposed to moisture and perspiration. Maintenance extends durability: clean the leather regularly with a soft dry brush, avoid stagnant water and occasionally apply a specific balm for quality leathers. A well-maintained strap can be regenerated by a watchmaker to extend its life by years.