Strap for Portugieser Perpetual Calendar 5023 White Gold / Ardoise

The lug width of the IWC Portugieser IW5023-07 is 22mm. This dimension is engineered to balance the 44.20mm case and should be verified by measuring the distance between the horizontal pins that protrude from the caseback. A 22mm strap integrates seamlessly without lateral movement or excessive tension.

For white gold, a polished black alligator creates clean contrast, whilst a vegetable-tanned calf with matte finish offers discreet elegance. Shell cordovan in warm tones (Titian red, cigar brown) ensures superior durability and a patina that emerges gradually. The choice depends on use: formal occasions suit alligator, versatility suggests cordovan.

Removing the strap requires a dedicated spring bar tool to depress the lateral pins and slide them free from the lugs. Position the spring bar upward, insert the tool gently between lug and strap, and press the pin toward the caseback. Repeat on the opposite side. Installation of the new strap follows the reverse process: insert pins and verify they are fully seated.

Yes, any strap with 22mm lug width is compatible. Milanostraps offers online artisanal 22mm straps in alligator, vegetable-tanned leather, shell cordovan and technical materials, all customisable in size, initials and stitching colour. The Casati Milano atelier creates bespoke straps with 18-month warranty.

Durability depends on material: alligator resists 3–5 years with regular use and maintenance; vegetable-tanned calf 2–4 years; shell cordovan 5–7 years owing to its structural rigidity. Daily wear, sweat exposure and humidity accelerate ageing. Periodic rotation amongst alternative straps extends the lifespan of each individual strap.