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

The lug width of the 123.25.27.20.57.004 model is exactly 18 mm. This measurement represents the internal distance between the two lugs of the case, where the strap attaches. To verify it, place a ruler between the two lugs: the internal space must be 18 mm. Any strap with 18 mm attachments will be perfectly compatible with this watch.

For this model, the best strap is alligator in cognac, dark brown or black tones. The natural structure of alligator leather, with its characteristic grain, interacts magnificently with the mother-of-pearl reflections and amplifies the warmth of the rose gold. Alternatively, smooth, solid-color calf leather maintains a minimalist profile that lets the play of light between the metals and the dial take center stage. For maximum versatility, a heavy cotton NATO strap allows quick changes while maintaining elegance.

Changing the strap is simple: get a spring bar tool. Position the watch on a stable surface, locate the small metal pins that connect the strap to the lugs, and use the tool to compress the lateral pin while you pull out the strap. Once removed, insert the new strap by aligning the attachments with the lugs, then compress the pin to make it click into position. If you're unsure, trust a professional watchmaker: the service takes just a few minutes.

Yes, many aftermarket straps are compatible, as long as they are made with an 18 mm lug width. Milano Straps offers a collection of customizable 18 mm leather straps in various textures, colors and thread stitching. The Casati Milano atelier also creates bespoke straps with personal leather selection and 18-month warranty, allowing you to fully customize your watch while maintaining the highest construction standards. Compatibility is guaranteed by the correct 18 mm lug width.

A quality leather strap (alligator, calf, cordovan) typically lasts 3-5 years with daily use, varying based on care and exposure to external elements. Natural leather ages gracefully: it develops a patina that enriches its character. If treated with care (avoid prolonged immersion and dry thoroughly after accidental water contact), a fine leather strap can last even longer. Milano Straps guarantees 18 months on Casati artisanal straps, and offers replacement and regeneration services to extend the life of your strap.