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

The lug width of the Constellation 131.15.29.20.53.001 measures exactly 18mm. This dimension is critical for compatibility with aftermarket straps: any strap must be designed for this specific width, with maximum tolerance of ±0.5mm to avoid lateral play on the case.

The choice depends on usage: a dark brown alligator (aged cognac) is ideal for elegant formality and daily wear; vegetable-tanned calfskin offers immediate softness and natural aging; a grey-blue NATO adds dynamism while maintaining sophistication; grey or black FKM rubber ensures practicality without maintenance. All these materials are available online in 18mm size and customizable through Casati Milano.

The strap is changed via the spring bars (spring bar remover). Position the watch with the spring bar terminals facing you, insert the Spring Bar Remover tool under the spring bar terminal pushing gently inward to release the internal spring, remove the old strap, insert the new 18mm strap into the housings and verify that the internal springs are properly anchored on both sides.

Yes, numerous 18mm straps are compatible. MilanoStraps offers a complete collection of 18mm straps in leather, NATO and rubber, ready to ship. All can be customized in sizes, initials and stitching thread color. For custom requirements, the Casati Milano atelier creates bespoke straps with personal material consultation and 18-month warranty.

A quality leather strap (alligator, vegetable-tanned calfskin or shell cordovan) lasts on average 3-5 years with daily wear, depending on frequency of use, climate and maintenance. The leather softens and develops natural patina in the first 6 months. A NATO or FKM rubber strap has superior durability (5-10 years) as they resist moisture better and require no preventive maintenance.