Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Yellow Gold / MOP

The lug width of the Constellation 131.50.29.20.55.002 is 18 mm. This measurement is critical: it must be verified from edge to edge of the inner lug. An incorrectly sized strap will result in junction gaps and premature wear. We recommend measuring twice before ordering.

For this model we recommend natural alligator in chocolate brown or cognac tones, which enhances the 18-carat yellow gold without chromatic conflict. Shell cordovan is the sophisticated alternative, developing a lustrous patina over time. Vegetable-tanned calf leather offers versatility and comfort. We advise against pure black: it disrupts the aesthetic continuity of the gold.

Strap replacement is accomplished by extracting the spring bars that connect between the lugs. Use a dedicated tool—a spring bar tool—inserting it gently into one of the small lateral holes on the case. Extract the spring bar downward, keep the case stable on a soft cloth, and thread the new strap ensuring the lugs are well-centered before reinserting the spring bar. Proceed with care: the reduced diameter (29 mm) requires millimetric precision.

Yes, you may wear aftermarket straps provided they respect the 18 mm lug width and total length suitable for your wrist. We recommend superior quality leathers (alligator, shell cordovan) so as not to diminish the value of the Co-Axial movement and solid gold case. Milanostraps offers curated selections of 18 mm straps compatible with this reference.

Durability depends on leather quality and usage. Natural vegetable-tanned alligator resists 3-4 years with moderate daily wear, while shell cordovan reaches 5-6 years. Vegetable-tanned calf has intermediate durability (2-3 years). Natural aging is aesthetic, but when the strap shows deep cracks in the lugs or structural failure, replacement is advisable. Casati Milano offers an 18-month warranty on all custom straps.