Strap for Constellation Co-Axial 31 Yellow Gold / Champagne

The lug width of the Constellation 123.50.31.20.08.001 is 18mm. This measurement is the essential parameter for selecting a compatible strap. To verify it yourself, measure the distance between the two lateral pins protruding from the case: it must be exactly 18 millimetres. Any deviation from this measurement compromises the fit and final aesthetics.

For a yellow gold Constellation, the best strap is honey-brown alligator with a gold buckle: this combination enhances the warm tone of the case and creates tonal harmony without compromise. Alternatively, vegetable-tanned calf (dark brown or cognac) offers the possibility of a diachronic patina that ages elegantly in parallel with the gold. For formal occasions, a black leather strap with a deployant clasp is the timelessly elegant choice.

To change the strap, you need a specific tool (spring bar tool) and delicate handling. Position the watch on a soft surface, locate the metal pin that connects the case to the strap, insert the spring bar tool into the small lateral slot to compress the internal pin, and extract the pin itself. Repeat on the other side. Insert the new strap (18mm lug width) by aligning the strap holes with the pins and press until they click into position. If you lack experience, entrust the task to a qualified watchmaker to avoid damage to the case.

Yes, it is possible to use an aftermarket strap provided that the lug width is exactly 18mm and that the construction quality is consistent with the value of the watch. Milano Straps offers 18mm straps online compatible with the Constellation, with customization options in sizes, initials, and thread colour. For a bespoke result with personal choice of leathers and direct support, the Casati Milano atelier creates custom straps with an 18-month warranty.

The lifespan of a leather strap depends on the quality of the material, daily use, and the care applied. A handcrafted alligator or shell cordovan strap can last 5-10 years with frequent use and periodic rotation with other straps. Vegetable-tanned calf develops a rich patina after 3-5 years and continues to age elegantly. Regular rotation (alternating the strap with others every 2-3 days) significantly extends its lifespan. Straps made with a <a href="/pages/termine-glossario/deployante">deployant clasp</a> require less maintenance than those with a traditional buckle, as they reduce wear from frequent opening and closing.