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

The lug width of the Constellation 131.58.29.20.99.005 is 18mm, an ISO standard that requires precisely calibrated straps. This measurement must be taken perpendicularly between the two lugs, from the inner edges, excluding the case material. A common mistake is confusing lug width with case thickness (7.9mm in the case of the 131.58.29.20.99.005).

For a Constellation 131.58.29.20.99.005, the most suitable straps are: alligator in dark brown or black (classic elegance), vegetable-tanned calf in natural tones (understated sophistication), shell cordovan bordeaux (conscious sportiness), and synthetic rubber for technical applications. The choice depends on your usage context and personal aesthetic. Sedna Gold pairs particularly well with warm leather tones and straps with 18kt gold deployant clasps.

To change the strap on your Constellation 131.58.29.20.99.005, you will need a spring bar tool. Position the watch face-down on a soft surface to avoid scratches. Gently insert the tool into the hole of each spring bar (the spring that holds the strap), press downward to disengage the spring, then remove the strap. Repeat on the opposite side. To install the new 18mm strap, align the two spring bars with the case lugs and press until the spring locks into place. Verify that the strap is perfectly centered and that there is no lateral play.

Yes, any strap with an 18mm lug width is compatible with the Constellation 131.58.29.20.99.005, regardless of the manufacturer. MilanoStraps offers a collection of 18mm straps in various materials (alligator, vegetable-tanned leather, shell cordovan, rubber) customizable in sizes, colors, stitching threads, and initials. The Casati Milano atelier also provides custom-made straps created artisanally with personalized consultation and an 18-month warranty.

A quality leather strap can last 2-4 years with daily use, depending on the type of tanning and exposure to environmental factors. Vegetable-tanned leather develops a natural patina that improves it over time, while chrome-tanned leather has a shorter lifespan. To maintain your strap: avoid prolonged exposure to water and direct sunlight, clean regularly with a soft dry cloth, condition with specific creams every 6 months, and rotate between different straps to distribute wear. The deployant clasp or stitching may require adjustments after 18-24 months of regular use.