Strap for Portugieser Chronograph Red Gold / Grey

The IWC Portugieser IW3716-10 features a 20 mm lug width, which is exclusive to this model and engineered for balanced proportions with the 41 mm red gold case. To verify the measurement, check the distance between the spring bar holes: it must correspond precisely to 20 mm.

Alligator remains the natural choice for this reference: the fine grain texture and lustrous leather create visual continuity with the red gold. A deep cognac enhances the metal's inherent warmth, whilst pure black introduces maximum formality. For longevity and organic patina development, vegetable-tanned calf leather in burgundy-brown is excellent and develops a rich patina over time.

Strap replacement occurs via the spring bars: a small tweezers or dedicated removal tool allows you to push the bars inward to disengage the previous strap. The new 20 mm strap is then inserted by aligning the side holes with the spring bars and pushing until mechanical stop. For a professional approach, Casati Milano performs strap changes by appointment with utmost care.

Yes, all straps with a 20 mm lug width are compatible, provided the material thickness and rigidity are adequate for supporting the red gold case weight. We recommend selecting robust hides—alligator, shell cordovan, dense calf—rather than supple materials that might sag under the case mass. Superior quality straps maintain the restrained aesthetic demanded by Portugieser design.

A quality leather strap—alligator, cordovan, or vegetable-tanned calf—typically lasts 3–5 years with regular wear, provided it is properly maintained and protected from excess moisture. Vegetable-tanned leather, in particular, ages with dignity and develops a patina that visually extends its life. Casati Milano warrants its bespoke straps for 18 months and offers restoration and maintenance support.