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

The lug width is exactly 18mm. This measurement is critical for compatibility: a strap must fit perfectly on the suspension pins of the tonneau case, without lateral play or excessive tension. Always physically verify the vertical distance between the lugs before purchasing an aftermarket strap.

Dark brown or mahogany alligator is the traditional choice: the regular grain reflects the formal aesthetic of the tonneau case. For a more contemporary approach, vegetable-tanned calf leather aged in beige or cream creates an interesting tonal contrast. Black alligator is the universal formal variant.

The strap is secured with standard suspension pins (18mm). You will need a small flathead screwdriver and a pin remover (or a watchmaker's needle). Gently push the pin inward until the retaining spring releases. We recommend having a professional watchmaker guide you through this the first time, especially with a Constellation of this value.

Yes. All straps from the 18mm collection have been tested on this specific geometry. Each strap is manufactured with millimeter tolerances that guarantee perfect fit without play. You can order them online ready for shipment, or request customizations (custom sizes, initials, thread color) through Casati Milano.

A quality strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years with daily wear and ordinary care (monthly cleaning with a damp cloth). Longevity depends on body perspiration, sun exposure, and frequency of wear. A Casati Milano strap includes 18 months of manufacturing warranty against workmanship defects.