Strap for Portofino Automatic Moonphase / Yellow Gold / White / Strap

The IWC Portofino IW3550-01 features a lug width of 18 millimetres. This measurement is taken between the two centre holes that accommodate the spring bar attachments. Any compatible strap must respect this specification to ensure proper fitting and correct aesthetic balance of the case.

For the yellow gold IW3550-01, the finest pairings are opaque black alligator for maximum formal elegance, or vegetable-tanned calf leather in dark brown for a patina that evolves with time. Shell cordovan is a noble solution if you prefer natural lustre that complements rather than competes with the gold. All straps must feature an 18mm lug width.

To change the strap, use a spring bar removal tool. Position the small hammer end against the spring bar attachment point and apply gentle pressure inward towards the case centre to release the bar from its seat. Once extracted, the strap detaches. Repeat on the opposite side. To fit the new 18mm strap, insert the spring bar through the attachment lugs of the new strap and push until the bar clicks into the case seats.

Yes, any aftermarket strap with an 18mm lug width is compatible with the IW3550-01. We recommend superior quality leathers such as alligator, vegetable-tanned calf, or shell cordovan to preserve the sober and constructive aesthetic of the Portofino. Avoid excessively thick straps, as the case has compact proportions and the strap must maintain visual balance.

Longevity depends on leather quality and usage patterns. Natural alligator withstands between 4 and 6 years of regular wear before showing evident signs of wear at the attachment holes. Vegetable-tanned calf lasts 3 to 5 years depending on humidity and sun exposure. Shell cordovan, thanks to its density, exceeds 6 to 7 years. A well-crafted strap, such as those from Casati Milano, includes maintenance and reinforcement of attachment points during the 18-month warranty period.