Strap for Pilot's Watch Mark XVIII Antoine de Saint Exupery

The IWC Pilot IW3270-03 has a lug width of 20 millimetres. This dimension is the internal width between the lugs of the case and is essential for selecting a compatible strap. A 20 mm strap fits securely without lateral movement and maintains the visual proportions of the 40 mm dial.

For the IW3270-03, leather straps with vegetable tanning are ideal – alligator in brown or black, Italian calf, shell cordovan – as well as technical options in rubber or canvas NATO. Your choice depends on use: leather conveys elegance and develops patina with age; rubber provides water resistance; canvas is the authentic aviator choice. With the black dial and white gold indices, a dark brown calf or grey alligator create sober, legible pairings.

To change the strap on your IW3270-03: place the watch on a soft surface; use a spring bar tool to gently lift the lug pin; remove the old strap by pressing it outward; insert the new 20 mm strap, aligning the holes with the lugs; press until the spring bar clicks into place. If unsure, Casati Milano atelier offers this service with personalised guidance.

An OEM (original equipment manufacturer) strap is supplied by IWC with the new watch: built to factory specifications, with rigorous finishing and guaranteed. An aftermarket strap is made by other manufacturers. Quality is not inferior if produced by established craftsmanship – for example, Casati Milano straps – but offers stylistic freedom: bespoke materials, exclusive colours, hand-finished details, and the possibility of tailoring strap length to your anatomical proportions.

The lifespan of a leather strap depends on use and material. A high-quality calf strap withstands 2–3 years of daily wear with visible but functional ageing. Alligator or shell cordovan, being more robust, easily reach 3–5 years. Canvas NATO is almost unlimited. Wear begins at the buckle, lug friction, and perspiration. Bespoke straps from Casati Milano, made with premium leathers and mercerised thread, age beautifully and carry an 18-month guarantee. Regular maintenance (leather conditioning every 6 months) significantly extends lifespan.