Strap for Constellation Co-Axial 38 Stainless Steel / Yellow Gold / Champagne

The lug width of the Constellation 123.20.38.21.58.001 is precisely 18 mm. This measurement defines the distance between the internal lugs that connect the integrated bracelet to the case. Accurate measurement is essential before ordering an aftermarket strap, as even half a millimetre variance would result in unacceptable play or complete incompatibility.

Alligator is the most stylistically natural choice for the Constellation 123.20.38.21.58.001, as its regular texture and inherent lustre emphasise the watch's "fine watchmaking" philosophy. Vegetable-tanned calf leather offers a softer grain and pronounced ageing characteristics. Shell cordovan is a rare but stunning choice with the steel-yellow gold combination, though it requires an initial break-in period.

To change the strap, you must remove the spring bars securing the bracelet to the case lugs. Use a spring bar tool or a blunt needle to compress the small internal spring and slide the pin free. Once the pins are extracted, the bracelet releases completely. For mounting a new strap with an 18 mm lug width, insert the pins into the strap's lug holes and snap the spring mechanism into position.

Yes, provided the strap is dimensioned for an 18 mm lug width. Milano Straps' compatible straps are specifically engineered for this measurement and offer construction quality equivalent to the original integrated bracelet. Always verify that your bracelet's spring bars are removable: whilst most Constellations allow this, some vintage models may feature fixed pins requiring professional watchmaker intervention.

Durability depends on leather type and frequency of use. Quality alligator with vegetable tanning maintains structural integrity for 3–5 years of daily wear before replacement. Vegetable-tanned calf leather has a similar lifespan, whilst shell cordovan can last 5–7 years due to its density. Ageing is natural and desired in these materials: creasing and patina are signs of authenticity. Milano Straps straps include an 18-month warranty and can be regenerated through professional reconditioning.