Strap for Portofino Automatic Stainless Steel / Blue / Alligator

The IWC Portofino IW3565-23 features a lug width of 20mm. This dimension represents the distance between the two anchor points where the strap attaches to the case. To verify compatibility, measure the internal spacing between the lugs using a digital calliper, positioning it perpendicular to the watch's longitudinal axis. Standard compatibility tolerance is ±0.2mm.

Alligator leather with pronounced vertical grain is the natural choice for this reference: the scale texture harmonizes elegantly with the brushed stainless steel case, creating a coherent tactile composition. Alternatively, vegetable-tanned calf leather with a matte finish provides an elegant contrast and develops natural patina over time. For seasonal versatility, a black synthetic cotton NATO or silicone rubber strap ensures practical durability without aesthetic compromise.

Strap replacement requires two specialized tools: a spring bar tool (pin extractor) and optionally a jeweller's loupe for alignment verification. Place the watch on a soft surface (microfibre cloth) to prevent scratches. Locate the small hole at the base of each lug where the spring bar pin seats. Insert the spring bar tool gently into the hole, applying light lateral pressure until the pin yields. Remove the old strap, then align the replacement strap by first inserting one end of the spring bar into its housing, then pressing gently until the pin clicks into place. Verify the strap is centred relative to the case.

Yes, any strap featuring a 20mm lug width is mechanically compatible. However, aesthetic compatibility depends on material and colour selection. An aftermarket strap in alligator, calf or silicone with 20mm width fits perfectly into the spring bar housings of the case. We recommend selecting artisanally-crafted straps that respect the visual proportions of a 40mm case: excessive thickness (exceeding 4mm) or overly polished finishes may appear incongruous with the Portofino's aesthetic sensibility.

A natural leather strap (alligator, calf or shell cordovan) typically lasts 3-5 years with moderate daily use (4-5 days weekly). Longevity depends on environmental factors: prolonged exposure to water, elevated humidity and thermal fluctuations accelerate deterioration. A vegetable-tanned calf strap with developed patina may last up to 7 years with periodic maintenance (damp cloth cleaning and specialist cream conditioning). Silicone or synthetic rubber straps offer superior durability (7-10 years) but require more frequent cleaning to prevent dirt accumulation and bacterial proliferation.