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

The lug width of this model is 18 millimeters. This measurement represents the distance between the two metal lugs of the case and determines compatibility with any artisanal strap. To verify it, measure the internal space between the lug walls on the case with a ruler placed horizontally at 12 o'clock or 6 o'clock.

African alligator in hazelnut brown tone is the most balanced choice: the natural scale texture dialogues elegantly with the Sedna Gold case without competing. Vegetable-tanned calf represents a versatile alternative, developing a noble patina over time. Japanese shell cordovan is ideal for more dynamic contexts, thanks to its structural durability.

Use a spring bar tool to apply gentle pressure on the small metal pins (spring bars) that hold the original strap to the case lugs. Remove the old strap by sliding the pin out of its seat, then insert the new strap by aligning the holes with the pins and pressing until it clicks. Avoid excessive twisting during the operation to prevent scratching the Sedna Gold.

Yes, any strap with an 18mm lug width is compatible with this model. However, it is essential to verify that the strap thickness does not exceed 4-4.5mm, to prevent it from being too bulky compared to the delicate proportions of the 29mm case. Milano Straps offers customized straps with guaranteed compatibility and optimal proportions.

The lifespan depends on the material: high-quality artisanal African alligator lasts 5-7 years with regular (non-daily) use; vegetable-tanned calf 4-6 years; shell cordovan 6-8 years thanks to its structural density. Early replacement is possible and recommended if the leather shows permanent creasing, cracking, or detachment from the stitching. Casati Milano offers an 18-month warranty on all bespoke straps.