Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Sedna Gold / Green Aventurine

The lug width of the Constellation 131.53.29.20.99.002 is 18mm, which is the internal distance between the two lugs of the case. This measurement is specific to this model and ensures stable and harmonious anchoring on the 29mm Sedna Gold case.

For the 29mm Sedna Gold Constellation, a cognac or dark brown alligator is the most balanced choice: the vertical grain reflects light harmoniously with the case, and the patina of time amplifies elegance. A vegetable-tanned calf leather in tobacco tone offers a more informal and textured variant.

Strap replacement requires a spring bar tool: locate the small lateral slots beneath the upper lug, insert the tool to compress the internal springs, gently extract the metal spring, then remove the lug. Repeat for the lower lug. For installation, reinsert the springs by compressing them in the same manner and ensure the new lug adheres perfectly to the case.

Yes, any strap with an 18mm internal lug width is compatible. We recommend artisanal quality leathers (alligator, calf, shell cordovan) to maintain aesthetic cohesion with the Sedna Gold case and ensure multi-year durability without fiber breakdown.

The average lifespan is 18-36 months of daily use, varying according to leather type, climate, and wrist wear. Quality alligator tends to last toward the upper end of the range. Vegetable-tanned calf, though more fragile, develops ennobling patina that compensates for accelerated wear after 24 months.