Strap for Portofino Automatic Stainless Steel / White - Railroad / Strap

The Portofino IW3513-39 requires an exact lug width of 18mm. This dimension is specific to the 34mm case and is essential for achieving correct proportions without creating visual misalignment with the lugs. Verify the measurement with a calliper between the two case attachments.

For the Portofino IW3513-39, we recommend Bayeux <a href="/pages/termine-glossario/alligatore">alligator</a> in medium or dark brown, which creates a perfect visual dialogue with the white dial. Alternatively, thin <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> (1.4-1.6mm thickness) offers exceptional durability and a patina that evolves over time. Avoid thicknesses exceeding 1.8mm on this 34mm case, as they would distort the proportions.

The change is accomplished by extracting the spring bars that connect the lugs to the case. With the appropriate tool (pry bar), gently compress the pin inward, creating sufficient space to remove it from the slot. Repeat on the other side. Installation of the new strap follows the reverse path: insert the pin into the case, then guide the strap into the slot until the click-lock engages. If inexperienced, consult a watchmaker.

Yes, provided it respects the 18mm lug width. High-quality artisanal aftermarket straps (such as those offered by Milano Straps) are compatible with your Portofino IW3513-39, provided the original spring bars are intact and functional. Always verify the width before ordering.

A quality artisanal strap with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> or shell cordovan lasts an average of 2-4 years with moderate daily use. Durability depends on environmental humidity, sun exposure, and frequency of use. Milano Straps guarantees 18 months on all bespoke straps created by Casati Milano, with the option of regenerating the leather through specific treatments.