Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Stainless Steel / Sedna Gold / Brown Diamond

The lug width of the Constellation 131.20.29.20.63.001 is 18 millimetres. This measurement is specific to women's models with a 29mm case and is essential for selecting compatible straps. You can verify it by measuring the internal distance between the two side lugs with a digital calliper.

For the Constellation 131.20.29.20.63.001, we recommend black alligator for formal elegance, naturally tanned calf for daily versatility with evolving patina, or shell cordovan for those desiring natural burgundy-brown colour. The choice depends on use and preferred aesthetic tone: lightness or chromatic character.

Remove the watch. Using a spring bar tool (a spring tool available at any watch shop), apply gentle pressure against the end of the internal spring of the lug to release it from its seat. Repeat on the other side. Insert the new 18mm strap by aligning the spring in the case cavities and ensure it is locked. The operation takes 3-5 minutes.

Yes, any quality 18mm strap is mechanically compatible. Verify that the thickness does not exceed 3mm and that the strap is straight (not pre-curved for larger models). MilanoStraps offers 18mm straps verified for your Constellation, customisable in leather, colour and thread stitching.

A strap in alligator or naturally tanned calf lasts 3-5 years with daily use and ordinary maintenance (periodic cleaning, avoiding direct salt water). Shell cordovan can last up to 7 years thanks to the superior density of the material. Durability varies based on climate, frequency of use and exposure to moisture. Casati Milano guarantees 18 months on artisanal straps.