Strap for Portofino Automatic Yellow Gold / Silver - Breguet / Strap

The lug width of the IWC Portofino IW3513-05 is 18 millimetres. This measurement represents the internal space between the lug pins where the strap is inserted. It is essential to verify this compatibility with precision using a digital calliper, as even differences of ±0.5mm cause visual misalignment between the case and strap.

For the IWC Portofino IW3513-05 in yellow gold, genuine alligator represents the natural choice: regular scales and slightly translucent texture create chromatic harmony with the precious metal. Alternatively, shell cordovan with vegetable tanning develops a warm patina over time that echoes that of yellow gold. Deep brown calfskin offers versatility and aesthetic compactness for daily formal contexts.

To replace the strap, position the watch in a dedicated watch holder and locate the lug pin (the micro metal pin that passes through the case). Using a watch pin remover, gently push the pin from one direction until it emerges from the other side. Remove the old strap and align the new strap with the lug holes. Reinsert the pin with controlled movement until it clicks into place. Verify that the strap has no lateral play.

Yes, it is possible to use aftermarket straps provided they strictly respect the 18mm lug width. Straps of artisanal quality produced by specialist manufacturers (such as those offered by Milano Straps) guarantee millimetre tolerances and finishes consistent with IWC standards. Avoid generic straps that do not meet technical specifications, as they cause case misalignment and compromise the collectible value of the watch.

The lifespan of a leather strap depends on the material, tanning process and intensity of use. A premium quality alligator strap lasts 5-8 years with moderate maintenance (regular cleaning with a soft cloth, drying after humidity exposure, periodic application of specific balm). Shell cordovan with vegetable tanning has superior longevity (8-12 years) thanks to the structural resistance of horse leather. A standard calfskin strap lasts 3-5 years. The patina that develops does not indicate deterioration, but natural ageing that increases the aesthetic appeal of the piece.