Strap for Portofino Automatic Stainless Steel / White - Roman / Bracelet

The lug width of the IWC Portofino IW3513-40 is 18 mm. This measurement refers to the distance between the two lateral pins (lug pins) that secure the strap to the case. To verify this, apply a calliper perpendicular to the pins without removing the original strap. The 18 mm lug width was the standard for dress watches until the early 2000s and is now increasingly sought after in vintage and classical models.

For this yellow gold Portofino, we recommend dark brown or cognac alligator for formal occasions: the fine grain enhances the precious metal without excess. Alternatively, vegetable-tanned calf in mid-brown develops a natural patina with wear, building character and unique tactile appeal. For less formal contexts, burgundy shell cordovan paired with a steel deployante buckle creates a sophisticated and practically versatile effect.

Strap replacement requires a spring bar tool with a bifurcated tip. Position the tool in the internal recess of the case lug pin, pressing gently downward to apply pressure on the spring mechanism inside. This releases the strap from the case. Repeat on the second lug. To install the new strap, align the pins with the case lugs and apply light pressure until you feel a click: the strap is now secured. Avoid excessive force to prevent damage to the pins.

Yes, any strap with an 18 mm lug width (measured between the lateral pins) is compatible with the Portofino IW3513-40. Aftermarket straps offer design freedom: you can choose premium materials such as alligator, shell cordovan, vegetable-tanned calf, FKM rubber, personalising colours, stitching thread and buckle type (ardillon, deployante, velcro) according to your formal needs and comfort preferences.

The durability of a leather strap depends on frequency of use, climate and material choice. Quality alligator or calf, worn daily, lasts 3–5 years before fibres show visible signs of fatigue. Shell cordovan tends to last slightly longer (5–7 years) due to the natural compactness of the material. In hot, humid climates durability is reduced. Proper maintenance (cleaning with a damp cloth, protection from direct impacts) extends strap life by 1–2 years.