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

The IWC Portofino IW3513-04 requires a lug width of 18 millimetres. This measurement is specific to the model's historical proportions and corresponds to the distance between the two spring bars connecting the strap to the case. Precise measurement with a digital calliper is recommended before purchasing an aftermarket strap.

Mississippi alligator represents the most elegant and historically accurate choice: its fine grain enhances the gold without competing visually. Alternatively, premium leather in vegetable tanning (dark brown or cognac) offers ageing patina and discreet sobriety. For more sporty contexts, matte rubber or NATO maintains classical functionality.

Strap replacement requires a spring bar tool (a small lever instrument) to remove the elastic pins securing the strap to the case. Insert the tool into the small slot beside the pin, apply gentle pressure to compress it, extract the strap and repeat on the opposite side. The new strap is installed by aligning the lug to the pins and allowing them to click into position. This operation can be performed independently or through a watchmaking service.

Yes, any strap with an 18-millimetre lug width is mechanically compatible. However, construction quality and materials vary significantly among manufacturers. Artisanal straps in premium leather maintain visual proportions and aesthetic ageing in line with the dignity of yellow gold, whilst inexpensive industrial straps may appear disproportionate or deteriorate prematurely.

A quality leather strap (alligator, premium calf) typically lasts 3–5 years with regular wear, up to 7–8 years with rotation among multiple straps. Vegetable tanning maintains a protein structure that resists degradation over time, whilst chemical tanning tends to degrade more rapidly. Visible ageing (patina, light creasing) is normal and desirable; structural deterioration (fractures, loss of elasticity) signals replacement is necessary.