Strap for Portofino Automatic / Stainless Steel / Black / Strap

The lug width of the IWC Portofino IW3533-25 is 20mm. This measurement refers to the distance between the inner edges of both lugs on the case and is specific to this configuration. Do not confuse lug width with case diameter (38mm): these are independent parameters. Always verify the lug width before purchasing a compatible strap.

For the Portofino IW3533-25, we recommend alligator leather in black or dark brown for formal use—natural scales create texture that doesn't compete with the dial. Vegetable-tanned calfskin is ideal if you desire a patina that evolves over time. A heavy canvas NATO transforms the watch into a travel instrument, while vulcanised rubber offers contemporary practicality. The choice depends on primary use: formal, daily, or adventure.

Measure with a digital calliper (or ruler) the distance between the inner edges of both case lugs: the value must be exactly 20mm. Position the calliper perpendicularly to the case, parallel to the dial. Incorrect measurement is the primary cause of incompatibility. If the reading differs, contact the seller for confirmation before ordering.

Yes, any artisanal strap constructed on a 20mm lug is compatible with the Portofino IW3533-25, regardless of original brand. Artisanal straps also allow customisation: leather selection, thread colour, embroidered initials. Ensure the strap is certified for 20mm lug width and do not confuse this measurement with other standard widths (18mm, 22mm, 24mm).

An authentic leather strap—alligator, calfskin, shell cordovan—lasts between 3 and 7 years with daily wear, depending on tanning method and care. Vegetable-tanned leather ages with visible patina but maintains durability. Vulcanised rubber has longer lifespan (10+ years) but develops no patina. Factors such as perspiration, sun exposure, and humidity accelerate wear. We recommend rotating straps seasonally to extend the life of each.