Strap for Constellation Quartz 25.5 My Choice Yellow Gold / Diamond / MOP

The lug width of the Constellation 1154.75.00 is 18 mm. This measurement is the standard for this generation of Constellation and is essential to ensure compatibility with any replacement strap. Measure the pin that holds the strap to the case: the distance between the two horizontal lugs must be exactly 18 mm.

For a yellow gold timepiece of this caliber, we recommend vegetable-tanned alligator (black, dark brown, or burgundy) as the first choice. Vegetable-tanned calf represents a softer and more refined alternative. For those seeking durability and the beauty of evolved patina, shell cordovan is the noblest solution. Avoid synthetic materials that would visually detract from your gold investment.

The replacement requires the use of a spring bar tool. Position the tool on the horizontal pin of the strap from the dial side, gently press to release the pin, remove the strap, then repeat on the other side. When installing the new strap, align the holes and push the pins until they click into place. If you prefer to avoid the risk of scratching the crystal, Casati Milano atelier can perform the operation for you.

Any strap with an 18 mm lug width is compatible. Online you will find a wide selection of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-18mm">artisanal 18mm straps</a> ready for shipment, customizable in color, length, and thread. Bespoke ateliers can also create custom straps with personally selected leathers.

Durability depends on the tanning method, use, and maintenance. A high-quality vegetable-tanned strap (alligator, calf, shell cordovan) maintains aesthetic and functional integrity for 3–5 years with daily wear, and beyond 10 years with occasional use. Natural patina development is desirable; deterioration begins when the leather starts to thin or separate from the stitching. Casati Milano straps carry an 18-month warranty against manufacturing defects.