Strap for Portofino Day & Night 34 Stainless Steel / Silver

The lug width of the IWC Portofino IW4598-01 measures exactly 16 millimetres. This specific dimension ensures the elegant proportions characteristic of the 34mm model. To verify this measurement, measure the space between the two lateral lugs where the strap anchors to the case: the value must be precisely 16mm.

For the Portofino IW4598-01, we recommend alligator straps in black or brown for formal occasions, or vegetable-tanned leather for daily wear. Shell cordovan represents an intermediate choice with evolving patina over time. All straps must feature a 16mm lug width to guarantee correct fit and aesthetic proportions.

The strap is replaced using a spring bar tool, a specialist instrument designed to release the elastic pins that anchor the strap to the lugs. Insert the flat tip under the pin's groove, push gently and lift the old strap. Repeat on the opposite side. Insert the new strap by first threading one pin into its lug, then lift the opposite side of the case to engage the second pin.

Yes, many artisanal aftermarket straps are available with 16mm lug width. Always verify that the width is exact: even 1-2mm difference compromises fit. Milano Straps offers a collection of 16mm straps customisable in material, colour and size, compatible with your Portofino.

A high-quality leather strap, worn daily, maintains excellent functionality for 3-5 years. Durability depends on intensity of use, climate conditions and tanning method. Vegetable-tanned leathers age by developing patina, whilst alligator and shell cordovan exhibit greater resistance. To extend lifespan, avoid prolonged exposure to water and direct sunlight.