IWC
Portugieser IW3583-05 (aka: IW358305)— lug 20mm

The IWC Portugieser IW3583-05 features a lug width of 20 millimetres. This dimension is specific to this chronograph family and must be verified using a digital calliper, positioning the point on the inner wall of the opposite lugs. It is essential to adopt the correct lug width to maintain the aesthetic and functional integrity of the watch, avoiding unexpected stresses on the lugs themselves.

Alligator with vegetable tanning is the most coherent choice: the symmetrical grain of the leather harmonises with the linear proportions of the ivory dial and develops a natural patina that evolves with use. Shell cordovan represents a European alternative of elevated density, remaining unaltered over time. Vegetable-tanned calf leather offers a good compromise between elegance and daily practicality, with greater chromatic versatility.

Changing the strap on a 20mm Portugieser requires specific tools: a spring bar tool with appropriately sized tips and a stable work surface. Position the watch with the lugs horizontal, locate the spring bar that holds the old strap, gently push the bar inward with the tool's tip to remove the strap. Insert the new strap by aligning the hole with the spring bar, ensuring that the strap base adheres perfectly to the lug base before releasing pressure. We recommend this operation by a competent authority if you lack experience.

The IWC Portugieser IW3583-05 is compatible with all straps featuring a 20-millimetre lug width. The milanostraps.it collection offers 20mm straps in alligator, vegetable-tanned calf, shell cordovan, canvas and elastomer, customisable in sizes, initials and stitching thread. The Casati Milano atelier crafts bespoke straps with personal choice of leathers and 18-month warranty.

The lifespan of a leather strap depends on use, tanning and environmental conditions. An alligator or shell cordovan strap with vegetable tanning, used discreetly and regularly maintained, retains full functionality for 5-7 years. Prolonged exposure to excessive humidity, perspiration and UV rays accelerates natural wear. Vegetable tanning allows surface regeneration that extends service life. Regular conditioning every 6-12 months and rotation with other straps significantly increases longevity.