Strap for Constellation Co-Axial 31 Red Gold / Diamond / Brown Supernova

The lug width of this model is 18mm. This means the compatible strap must have a width of 18 millimetres measured between the attachment pins. The pins have a diameter of 1.3mm and this specificity rules out any improvisation: only straps designed for this geometry guarantee correct tension and stability on the wrist.

Alligator remains the historical choice for this reference: fine grain and natural lustre amplify the warm reflections of rose gold. A cognac or tobacco-coloured alligator creates aesthetic continuity without competing with the dial. Alternatively, vegetable-tanned calf in bordeaux variants maintains formal elegance with more pronounced texture, while rubber with rose deployant offers practicality without aesthetic compromise for intensive use.

Changing the strap requires a spring bar tool — a small metal lever that compresses the attachment pin. Position the tool in the lateral slot of the pin, compress gently and extract. Repeat on the other side. Insert the new strap by aligning the lateral holes to the pins, then compress the pin to secure it. Delicate operation: on the rose gold model we recommend having it performed by an expert to avoid scratches on the rose gold case.

Any strap with 18mm lug width is compatible. Online you will find ready-to-ship straps in alligator, calf, shell cordovan and rubber. The best watchmaking brands also offer deployant systems for this width. Always verify that the strap has been specifically tested for premium-class watches: low-quality pins can scratch the rose gold case shoulders.

A high-quality artisanal alligator strap lasts 4-6 years with average daily use, while vegetable-tanned calf ranges between 3-5 years. Durability depends on exposure to moisture, perspiration and sunlight. The rose gold on the case develops natural patina; in parallel is the life of the strap. A shell cordovan strap, if cared for, exceeds 10 years. Rubber maintains elasticity for 6-8 years before hardening. On a watch of this quality, strap replacement is an investment, not an expense: each change is an opportunity for stylistic renewal.