IWC
Pilot IW3718-05 (aka: IW371805)— lug 20mm

The lug width of the IWC Pilot IW3718-05 (IW371805) is exactly 20mm. This width is proportionate to the 44mm case diameter and ensures visual and structural balance. It is essential to verify the lug width before purchasing a compatible strap, as different widths (18mm, 22mm, 24mm) will not fit correctly onto the case lugs.

For the IW3718-05 (IW371805), alligator or crocodile straps with medium grain offer formal elegance and develop natural patina over time. Vegetable-tanned calf or chromexcel represents a contemporary alternative that ages beautifully. For sports use, FKM rubber maintains aviation functionality. Standard fabric straps are not recommended given the mass of the 44mm case, unless they are robust marine canvas.

To change the strap on the IW371805, remove the spring bars from the case lugs using a dedicated tool (spring bar remover). Position the tool in the groove of the spring bar, press, and slide the end out of the lug. Insert the new 20mm strap by aligning the spring bars into the opposite lugs and verify the fit is secure. This is a delicate operation: it is recommended to contact professionals such as the Casati Milano atelier to avoid damaging the case.

Yes, quality 20mm aftermarket straps are fully compatible with the IW3718-05 (IW371805). Choose manufacturers specializing in precision measurements and finishing quality. Milano Straps offers a selection of handcrafted straps in alligator, calf, and rubber, as well as bespoke commissions through the Casati Milano atelier with custom hair-on options.

The lifespan of a leather strap depends on frequency of use, construction quality, and material. Artisanal-quality calf or alligator, with regular use (4-5 days per week), typically lasts 4-6 years before requiring replacement. Prolonged exposure to sun, water, and humidity reduces durability. Vegetable-tanned leathers age consciously, developing patina, while others require periodic maintenance with protective creams. The Casati Milano atelier offers an 18-month warranty on every bespoke strap.