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

The Omega Constellation 131.58.29.20.53.003 has a lug width of 18mm. This width was deliberately chosen to maintain correct proportions between the 29mm case diameter and the transition to the wrist. The steel pins protrude approximately 16-18mm from the case, and the linear distance between the inner walls of the two lugs is exactly 18mm. It is essential to verify this measurement before ordering an aftermarket strap, as a different width would not fit correctly.

For the Constellation 131.58.29.20.53.003 in Sedna Gold, we recommend alligator in dark shades (deep brown or black) for the regular texture of the grain that contrasts elegantly with the gold, or vegetable-tanned calf in cognac or tobacco for a warmer and more authentic aesthetic. Shell cordovan, although initially stiffer, develops an unparalleled patina over time and is ideal for those who consider the watch an investment. Avoid saturated colors – Sedna Gold deserves measured and sober chromatic accompaniment.

To change the strap you will need: a small nylon hammer, a spring bar tool, and a clean work surface. Position the watch with the lug facing you, insert the spring bar tool into the lateral hole of the spring to compress it, and gently extract the pin. Repeat on the other lug. Prepare the new strap by inserting the pins into the lugs, ensuring the spring clicks into position. If you are unsure, the Casati Milano atelier offers a strap change service by appointment in Milan.

Yes, any strap with an 18mm lug width is compatible with the Constellation 131.58.29.20.53.003. Milano Straps offers a collection of 18mm straps in various materials (alligator, calf, NATO, rubber) ready for shipment and customizable in length, initials, and thread color. For completely bespoke solutions with personal leather selection and consultative updates, Casati Milano creates made-to-measure straps by appointment with an 18-month warranty.

Durability depends on the material and usage. A vegetable-tanned calf strap, with moderate use (5-6 days per week), typically lasts 3-4 years before requiring replacement. Alligator, being more compact, can exceed 5 years. Shell cordovan is even more durable, reaching 6-7 years of regular use. The patina is natural and desirable – it represents the passage of time. Milano Straps recommends rotating straps when possible, allowing the leather to rest and extending its life. Casati Milano offers an 18-month warranty on all personalized straps and can perform repairs on damaged pieces.