Strap for Portofino 34 Stainless Steel / Green

The lug width of the IWC Portofino IW3574-12 is 16 millimetres. This measurement represents the internal space between the case lugs and determines strap compatibility. Tolerances of ±0.3mm are accepted by quality artisanal straps, but 16mm is the correct specification for this model.

For the Portofino IW3574-12, straps in dyed alligator (brown or black), vegetable-tanned calf, or shell cordovan are recommended. Alligator offers discreet elegance with subtle scale texture; vegetable-tanned calf conveys authentic craftsmanship; shell cordovan produces sophisticated lustre. Your choice depends on occasion and personal aesthetic preference.

To change the strap, use a spring bar tool to gently push the case lugs inward, releasing the strap terminals. Insert the new strap by aligning the terminal holes with the spring bars. Ensure the bars are fully seated and the strap is symmetrically positioned. If inexperienced, consult a watchmaker or Casati Milano atelier.

Yes, you may use compatible 16mm aftermarket straps. Milanostraps.it offers a collection of artisanal leather, rubber, and technical straps, all tested for this lug width. Ensure the strap features standard spring bars (3mm diameter) and that overall length suits your wrist.

A quality artisanal leather strap has an average lifespan of 3–5 years with daily wear, extending to 7–8 years if worn occasionally. Longevity depends on factors including tanning method (vegetable tanning lasts longer than chromium tanning), moisture exposure, frequency of wear, and periodic maintenance. Casati Milano straps come with an 18-month warranty.