Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Canopus Gold / Snow

The lug width of the Constellation 131.58.29.20.99.003 is 18mm. This width is the historical standard for 29mm Constellation models and is determined by the distance between the case lugs. Any aftermarket strap must strictly respect this measurement to ensure perfect fit without lateral play.

For Canopus Gold we recommend natural alligator with vegetable tanning, vegetable-tanned box calf, or aged shell cordovan. Alligator creates an elegant contrast with the metal; calf offers subtle accompaniment; cordovan adds chromatic depth. The choice depends on usage: formal (alligator), versatile (calf), vintage character (cordovan).

The Constellation is equipped with spring bars that are extracted with a specific tool. Position the watch on a soft pad, insert the spring bar removal tool into the spring loop end, apply gentle pressure to compress the spring, and remove the old strap. Insert the new strap by aligning the holes to the lugs and allow the spring to automatically re-engage.

Yes, any strap with 18mm lug width is compatible. MilanoStraps offers a complete collection of handcrafted straps in various leathers (alligator, calf, cordovan, NATO) customizable in size, initials, and stitching thread. The Casati Milano atelier also creates bespoke straps with 18-month warranty.

A quality leather strap with vegetable tanning has an average lifespan of 3-5 years with daily wear, conditioned by climate, humidity, and frequency of use. Shell cordovan, due to its natural density, can last 5-7 years. Regular maintenance—keeping the strap dry and occasionally applying conditioning balm—significantly extends durability and allows the leather to develop that unique patina appreciated by collectors.