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

The lug width of this model is 18mm. This means the strap must be exactly 18 millimeters wide between the two lugs (the ends that sit on the case). Precise measurement with a digital caliper is essential to ensure proper fit without play or forcing.

For a Constellation in Sedna Gold, chocolate brown or bordeaux alligator represents the most harmonious choice: the vertical grain enhances without competing with the warm tone of the case. Alternatively, a natural brown vegetable-tanned calf leather will develop a golden patina with age, or a cherry red shell cordovan for superior durability and distinctive crystalline texture.

The strap is removed by extracting the pins (small transverse metal pins) that secure it to the lugs. Use a dedicated tool (spring bar tool) or a thin pincer to compress the pin's internal spring and slide it out. Proceed gently to avoid scratching the Sedna Gold case. Once the pins are removed, the old strap slides off; the new one is threaded by aligning the lugs with the case and reinserting the pins until you feel the safety click.

Yes. Milanostraps.it offers a complete range of 18mm straps compatible with this model, in various materials (alligator, calf, shell cordovan, NATO, rubber) and customizable in length, initials, and stitching thread color. Custom options are also available at the Casati Milano atelier, with personal consultation and 18-month warranty.

Durability depends on the material and wear. Standard calf leather resists 2-3 years of daily use before replacement is needed due to lug failure or visible wear. Shell cordovan, being denser, can last 4-5 years. Well-maintained alligator resists 3-4 years. Leather exposed to humidity, direct sunlight, and perspiration wears more quickly. Vegetable tanning, while lasting as long as chrome tanning, develops a visible patina that some consider part of its charm.