Strap for Portofino Day & Night 34 Rose Gold / Silver

The lug width of the IWC Portofino IW4598-05 is 16mm. This measurement represents the distance between the spring bar attachment pins on the case. To verify, remove the current strap and measure the distance between the two holes with a calliper: you will find exactly 16mm. This is a model-specific dimension and non-standard in the market, so it is essential to verify it before purchasing an aftermarket strap.

Alligator leather is the most classical and aristocratic choice for the rose gold Portofino: earthy colours (tobacco brown, chocolate brown, black) pair naturally with the warmth of the metal. Alternatively, shell cordovan with natural tanning offers a patina that evolves over time, creating increasing elegance. For those preferring contemporary minimalism, vegetable-tanned calf leather in absolute black imparts austerity and versatility. A rubber strap guarantees everyday practicality whilst maintaining aesthetic dignity.

Changing the strap on the Portofino IW4598-05 requires a specific tool (spring bar remover) to compress the attachment pins. Position the watch on a soft surface with the strap facing upwards. Insert the flat tip of the tool into the small gap between the pin and the lug, gently compressing the pin. The strap will detach easily. To mount the new 16mm strap, align the holes at the strap ends with the lugs and press the pin until it clicks into place. If you are uncertain about the procedure, consult a professional watchmaker or contact the Casati Milano atelier.

All straps with a 16mm lug width are compatible with the Portofino IW4598-05. At milanostraps.it you will find a curated selection of high-quality straps in alligator, shell cordovan, calf leather, rubber and textiles, all available in 16mm size. Each strap can be personalised in length to fit your wrist perfectly, with options for initials and stitching thread selection. The warranty covers structural integrity for 18 months.

The lifespan of a leather strap depends on the material and usage. Alligator and shell cordovan, if properly maintained (avoiding prolonged moisture and dirt), last 5-8 years with moderate daily use. Calf leather is more sensitive to wear and requires more careful maintenance: it typically lasts 3-5 years. The most vulnerable part is the stitching thread, particularly under torsion: premium quality straps use multi-ply waxed thread that resists longer. The Casati Milano atelier guarantees its straps for 18 months against manufacturing defects, although natural leather ages and patinas as expected in its lifecycle.