Strap for Portugieser Perpetual Calendar Digital Date-Month Edition "75th Anniversary" Platinum

The lug width of the IWC Portugieser IW3972-01 is 22 millimetres. This measurement refers to the internal distance between the two spring bars (or lugs) attached to the case. It is essential to verify that the aftermarket strap has exactly 22 mm at the attachment point to ensure precise fitting and complete stability on the wrist, regardless of the visual width of the strap itself.

For the Portugieser IW3972-01 in platinum, alligator straps in black or dark brown are the most aesthetically appropriate. Alligator leather with vegetable tanning develops natural patina that elegantly contrasts with the rigour of platinum. Alternatively, Italian calf leather with artisanal finishes and burgundy shell cordovan maintain the balance between formality and modernity that characterises this model.

The strap is changed using a dedicated tool to remove the spring bars (the small pins connecting the strap to the case). Gently press the spring bar inward to detach it from its seat; remove the old strap and insert the new one, ensuring that the pins fit perfectly into the attachment eyelets. It is advisable to perform this operation on a soft surface to avoid scratching the platinum case.

Yes, you can use high-quality artisanal aftermarket straps provided they comply with the 22 mm lug width specification. Many enthusiasts choose custom straps from specialist craftsmen to adapt the model to specific comfort, style, or occasion requirements. Construction quality and materials are paramount: alligator, Italian calf or shell cordovan ensure longevity comparable to the watch itself.

The lifespan of a leather strap depends on the tanning process, frequency of use, and climatic conditions. A high-quality strap with vegetable tanning, worn regularly under normal conditions, typically lasts 5-7 years. Prolonged exposure to perspiration, moisture, and sunlight reduces this duration. Regular maintenance (gentle cleaning, air-drying) and rotation with other straps significantly extend the product's life.