Strap for Portugieser Chrono-Automatic Red Gold / Silver / Diamond

The lug width of the IWC Portugieser IW3714-86 is 20 millimetres. This dimension, also referred to as strap width or lug-to-lug measurement, represents the distance between the inner shoulders of the case lugs. To verify strap compatibility, measure the internal space between the two lugs precisely: it must equal exactly 20mm. A strap manufactured to this specific width ensures perpendicular alignment of the spring bar attachment and eliminates torsional stress on the buckle.

For the IW3714-86 in red gold, we recommend French alligator with uniform grain, as it amplifies the warm chromatic quality of red gold through its sculpted texture. Alternatively, Belgian shell cordovan offers natural patina development over time, creating a harmonious dialogue with the spontaneous patina of red gold. Italian vegetable-tanned leather introduces intentional tactile materiality, particularly striking on this chronograph. Strap choice depends on context: formal elegance requires dark brown alligator; daily versatility suggests neutral smooth calfskin.

Changing the strap on an IWC Portugieser requires extraction of the spring bars (springsbar) from the case lugs. Proceed as follows: place the watch on a soft cloth, locate the gap between the lug and current strap, insert a spring bar tool into the internal slot of the bar, apply gentle downward pressure until the bar detaches from its seated position. Remove the old strap. Insert the new strap (compatible with 20mm lug width) through the opposite aperture, then reinsert the spring bar until it locks with an audible click. Repeat on the opposite side. If you lack manual competence, consult a qualified watchmaker.

Yes, provided the aftermarket strap is manufactured to 20mm lug width specification. Many premium strap makers produce models compatible with this measurement. On milanostraps.it you will find 20mm-compatible straps ready for dispatch, crafted in premium materials including alligator, shell cordovan and Italian vegetable-tanned leather. Critical attention: verify that lug width is precisely 20mm, neither 19mm nor 21mm, to avoid play or excessive spring bar compression.

Leather strap longevity depends on material grade, maintenance discipline and frequency of wear. In alligator or shell cordovan, with moderate daily use and regular conditioning (every six months), typical lifespan is 4–6 years before the leather exhibits significant structural degradation. Italian vegetable-tanned leather, being inherently robust, may reach 7 years. Smooth calfskin, more delicate, averages 3–4 years. Casati Milano atelier provides 18-month warranty from manufacture. Rigorous maintenance—avoiding water exposure, applying UV protection, storing in dry environments—substantially extends strap service life.