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

The lug width of the IWC Pilot IW3706-27 is 20 millimetres. This measurement is specific to the model and refers to the internal distance between the two attachment points on the watch case lug. To verify it, measure internally between the holes using a digital calliper: an error in measurement will result in incompatible straps. On milanostraps.it you will find a comprehensive collection of compatible straps for this measurement.

To maintain aesthetic coherence and avionic functionality, we recommend dark tobacco alligator or cognac calf leather with vegetable tanning. Alligator offers fine grain and satin patina ideal for close-range reading; calf leather creates chromatic contrast with the black dial and ensures transpiration. Shell cordovan is the ideal choice for those exposing the watch to high humidity, thanks to the structural density of the material.

Remove the watch from your wrist. Use a spring bar removal tool to insert the flat lever between the lug and the case lug, applying gentle outward pressure. The internal spring of the lug will retract, allowing the lug to slide out of the hole. Repeat the same operation on the opposite lug. To install the new strap, insert the lug into the case lug hole and press inward until the spring clicks into position. Verify that the lug holes align exactly with the case holes.

Yes, provided the lug width is exactly 20 millimetres. Artisanal aftermarket straps of quality – such as those available on milanostraps.it – are constructed to the same dimensional specifications as OEM straps, guaranteeing full mechanical compatibility. IWC does not mandate exclusive use of original straps; conversely, many historical owners have always paired premium leathers with their Schaffhausen cases.

Durability depends on tanning method, climate and frequency of wear. A vegetable-tanned calf strap typically lasts between 3 and 5 years of regular use before showing significant wear at the edges and passant. Shell cordovan, thanks to superior fibre density, can last between 6 and 8 years. A NATO strap in ballistic nylon resists up to 10 years without structural degradation. All artisanal Casati Milano straps benefit from an 18-month guarantee against manufacturing defects.