Strap for Portofino Automatic Moon Phase 37 Stainless Steel - Diamond / Silver

The IWC Portofino IW6596-01 features a lug width of 18 millimetres. This dimension is specific to the model and requires straps designed for this exact measurement. The measurement is taken by positioning a digital calliper in the lug seat and verifying the internal distance between the two spring bars.

For the Portofino IW6596-01, we recommend alligator leather with rectangular grain for a classical pairing, vegetable-tanned calf leather for those desiring an evolved patina over time, or nylon NATO in high denier for a versatile everyday solution. The choice depends on intended use and the colour profile of the dial.

Strap replacement is performed using a dedicated spring bar removal tool to extract the pins from the lug seats. Position the tool vertically and apply gentle pressure to compress the spring pin, then withdraw it. Proceed with caution to avoid scratches on the case. For those lacking experience, we recommend contacting an authorised dealer or the Casati Milano atelier.

Yes, any strap with an 18-millimetre lug width is compatible with the IWC Portofino IW6596-01, regardless of brand. MilanoStraps offers bespoke artisanal 18mm straps in various materials and colourways, customisable in length and buckle finish (deployante or standard), ensuring measurement precision and construction quality.

A premium leather strap for the Portofino IWC lasts on average 3-5 years with daily wear, depending upon exposure to moisture, extreme temperatures and cleaning frequency. Vegetable-tanned leather develops a patina that extends its aesthetic appeal beyond this period. MilanoStraps supplies straps with an 18-month warranty and enables periodic replacements whilst maintaining the same measurement profile.