Strap for Portugieser Automatic 40 Stainless Steel / Chinese New Year

The lug width of the IWC Portugieser IW3583-15 is 20 millimetres, measured from centre to centre of the attachment lugs on the case. This specific measurement requires straps constructed to 20mm specifications to ensure proper fit and absence of play.

For the Portugieser IW3583-15, an alligator or shell cordovan strap is highly recommended. Alligator offers regular grain and a patina that evolves over time, whilst shell cordovan guarantees compactness and natural lustre. Both materials enhance the case steel and the elegance of the dial's proportions.

Strap replacement is accomplished by removing the spring bars connecting the lug attachments to the case. Use a dedicated spring bar removal tool to gently extract the bars, remove the old strap and insert the new one by aligning the lugs with the case attachments. The operation requires millimetre precision to avoid damaging the lug attachments.

Yes, any strap with a 20mm lug width is compatible with the Portugieser IW3583-15. The important thing is to verify that the strap is manufactured with care within its material category and that the attachments are precisely calibrated for the geometry of IWC lugs. Artisanal straps guarantee superior construction tolerance compared to industrial products.

A high-quality leather strap has an average lifespan of 3-5 years under normal conditions of use, depending on the material. Alligator and shell cordovan age by developing patina and increasing in character over time, whilst vegetable-tanned leather requires more active maintenance. Constant use and exposure to humidity accelerate wear; rotating with alternative straps prolongs the life of each.