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

The IWC Pilot IW3713-48 features a lug width of 21 millimetres, a distinctive construction specification of this model. This dimension, inherited from aviator requirements in the 1960s, limits mainstream market options and requires bespoke straps for optimal fit.

Alligator is the most eloquent choice due to its regular grain and patina development over time, creating striking contrast against the satin-brushed steel. Vegetable-tanned calf offers pronounced chromatic evolution, whilst textile NATO maintains the model's historical authenticity with military heritage.

Position a calliper between the metal pins of the case from shoulder to shoulder to obtain the internal measurement, then add the thickness of both lugs. For the IW3713-48, the result will always be 21 millimetres. Strap replacement involves removing the pins using a press or dedicated tool, an operation best performed by professionals.

Yes, any bespoke strap manufactured with 21mm lug width is perfectly compatible with the IW3713-48. Milano Straps supplies online straps customisable in leather, textile and rubber, available in standard sizes and bespoke orders for this specific width.

A quality leather strap, such as alligator or vegetable-tanned calf, maintains structural and aesthetic integrity between 3 to 5 years of daily use. Durability depends on exposure to moisture, direct sunlight and frequency of wear. Milano Straps straps include an 18-month warranty against manufacturing defects.