Strap for Constellation Co-Axial 27 Brushed Stainless Steel / Red Gold / MOP Supernova

The lug width of the Constellation 123.20.27.20.55.001 is 20mm. This width is specific to the women's models in the Constellation family and is essential for ensuring correct installation of any aftermarket strap. To verify it, measure the distance between the lug pins (from inner edge to inner edge) with a caliper or millimeter ruler. No approximation is tolerated: a 19mm or 21mm strap will not install correctly.

Alligator is the classic choice and most harmonious for this Constellation. The natural texture of the rectangular grain amplifies the geometric elegance of the case and pairs perfectly with the mother-of-pearl dial. Vegetable-tanned alligator, available in ivory, white, or black tones, offers a patina that develops over time. Calf leather is a versatile alternative, especially in coarse grain finishes, and allows for lasting aesthetic evolution. For more casual contexts, shell cordovan in cognac brown represents the highest artisanal expression, while sports rubber is ideal if you seek daily multifunctionality.

The procedure requires a spring bar tool (a specific tool for extracting the pins). Position the watch on a soft cloth, locate the fixing pins at the ends of the lugs, insert the bifid tip of the spring bar tool into the groove and compress slightly to release the pin, extracting it. Repeat for both sides. Once the old strap is removed, insert the pins into the new strap, aligning them perfectly with the lug holes. If you lack experience, rely on a professional: Casati Milano offers strap replacement service with warranty on the work.

Yes, all straps with a 20mm lug width are compatible. Milano Straps offers a specialized collection of 20mm straps in alligator, calf, shell cordovan, and rubber, customizable in length, stitching thread color, and addition of initials. Straps are available ready to ship or made to order for exclusive specifications. The Casati Milano atelier also offers bespoke strap creation service with personal leather selection and updates via WhatsApp.

Durability depends on the material, frequency of wear, and care. A quality alligator strap with vegetable tanning resists 3-5 years of daily use before requiring replacement. Calf leather has similar durability but develops a more visible patina. Shell cordovan is the most long-lasting (5-7 years) thanks to fiber density, and improves aesthetically over time. Sports rubber lasts 2-3 years. Casati Milano provides an 18-month warranty on all straps, covering construction defects. To extend useful life, avoid prolonged water exposure and dry immediately in case of rain.