IWC · Portofino

Strap for Portofino Automatic Red Gold / Ardoise / Diamond

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

20mm
Lug width20 mm
Case diameter40 mm
ReferenceIW3565-16 (aka: 3565-16, IW356516)
FamilyPortofino
MovementIWC caliber 35111 Hours, Minutes, Seconds | Date
CaseRed Gold

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Portofino IW3565-16 (aka: 3565-16, IW356516)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Portofino IW3565-16 (aka: 3565-16, IW356516), seen from the bench

The IWC Portofino features the automatic caliber 35111 with hour, minute, second and date functions. The watch has 20mm lugs and is part of the Swiss manufacturer's dress watch collection. The reference IW356516 maintains the essential characteristics of the three-hands timepiece with calendar complication.

Frequently asked questions

What is the lug width of the IWC Portofino IW3565-16?

The lug width is 20mm. To verify it correctly, position a calliper perpendicular between the two lugs. This width ensures balanced proportions on a 40mm case and maintains the elegant aesthetic typical of the Portofino.

What is the best strap for the IWC Portofino IW3565-16?

Alligator is the preferred choice: the fine grain of the leather dialogues perfectly with the refinement of rose gold. Calf leather in cognac or burgundy tones, or shell cordovan, are also excellent alternatives. Choose based on your personal style and intended use.

How do I change the strap on my Portofino?

Remove the current strap by depressurising the spring bars with a spring bar tool. Insert the bars into the passants of the new 20mm strap and secure them on both lugs. If unsure, consult a professional watchmaker to avoid damaging the case.

Can I mount an aftermarket strap on my IW3565-16?

Yes, any strap with a 20mm lug width is compatible. Quality varies significantly: we recommend noble leathers (alligator, calf, cordovan) to maintain the calibre of the watch. Always verify that the spring bars are the correct length and the strap is precisely constructed.

How long does a leather strap last on this watch?

Durability depends on material, usage, and climatic conditions. A quality alligator strap can last 3-5 years with regular maintenance. Shell cordovan tends to last longer (5-7 years), while calf leather averages 2-4 years. Vegetable tanning develops patina whilst maintaining structure for 4-6 years.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only