IWC
Portugieser IW3714-69 (aka: IW371469)— lug 20mm

The lug width is 20 mm. It is measured as the distance between the two metal pins that connect the strap to the case. This is a specific standard of the IWC Portugieser collection of this generation and is not compatible with different sizes.

Ebony Mississippi alligator is the most elegant choice, thanks to its regular grain and the patina that develops over time with rose gold. Alternatively, vegetable-tanned Tuscan leather in havana offers more robust construction and a vintage appearance. For daily wear, burgundy shell cordovan combines extraordinary longevity with natural luster.

You will need a spring bar removal tool. Place the watch on a stable surface, locate the pin on one side of the lug, use the tool to push the pin from the inside outward, and remove the strap. Repeat on the other side. Insert the new strap by aligning the holes and reinsert the pins. If you are not experienced, a watchmaker can complete the job in a few minutes.

Yes, all straps with 20 mm lug width are compatible. Milanostraps.it offers a collection of handcrafted straps in various materials (alligator, Tuscan leather, calf, shell cordovan) ready to ship, customizable in sizes, initials, and stitching thread. For an even more personalized experience, the Casati Milano atelier creates custom straps with direct selection of leather.

A quality leather strap, with vegetable tanning, lasts an average of 4–6 years with daily wear, depending on care and frequency of use. Shell cordovan and alligator are more durable (up to 8–10 years) due to fiber density. Continuous exposure to sweat accelerates aging; a well-maintained strap (cleaned and dried regularly) significantly extends its lifespan.