Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Stainless Steel / Grey - Diamond

The lug width of the Constellation 131.10.29.20.56.001 is 18mm. This measurement represents the distance between the two horizontal lugs of the case. You can verify it by measuring with a digital caliper between the lugs without including the attachment rings. Milano Straps offers a wide selection of 18mm straps compatible with this model, all customizable.

Louisiana alligator and shell cordovan represent the most refined choices for the Constellation 131.10.29.20.56.001. Alligator imparts silently elegant authority with its regular grain, while shell cordovan develops an aging patina that increases in beauty over time. Natural vegetable-tanned calf leather is ideal for those seeking softness and breathability without sacrificing sartorial tradition. The technical choice remains the FKM rubber strap for absolute UV resistance.

The Constellation 131.10.29.20.56.001 uses standard spring bars. Use a hardened steel spring bar tool, not plastic. Insert the flat tip into the small recess at the base of one of the bars, push gently inward until the bar retracts, then slide out the old strap and replace it with a new one. Proceed with measured movements to avoid scratching the bezel – the 316L stainless steel case is soft compared to satined finishes. If you prefer to avoid DIY, Casati Milano offers strap change service performed by hand in our atelier.

Yes, 18mm spring bar slots are standard in the international market. Milano Straps supplies straps in alligator, shell cordovan, vegetable-tanned calf, and technical materials, all tested for compatibility and construction quality. Each strap can be customized in length, stitching thread color, and embellishment with initials. The warranty extends to 18 months with Casati Milano's custom solution.

A high-quality natural leather strap (alligator, shell cordovan, vegetable-tanned calf) typically lasts 3–5 years with daily wear. Longevity depends on environmental humidity, sun exposure, pH of skin perspiration, and routine care. Shell cordovan tends to last longer than simple calf thanks to its superior fiber density. To extend its life, avoid prolonged immersion, dry the strap immediately if wet, and occasionally apply natural wax or strap-specific balm. Milano Straps recommends replacement when the strap begins to give at the lug attachment or when the patina becomes excessively worn.