Strap for Constellation Co-Axial 31 Stainless Steel / Yellow Gold / Champagne

The lug width is exactly 20 mm. This dimension is standard for all straps compatible with the Constellation 123.20.31.20.08.001 and is measured between the inner walls of the case lugs. You can easily verify it with a digital caliper positioned between the two case attachments.

Vegetable-tanned alligator is the premier choice for the Constellation, as it enhances the minimalist case architecture and gilded griffs. The fine grain of alligator creates an elegant material continuum with the metal details. Alternatively, French calf with natural patina offers a more immediate tactile narrative, with visual evolution over time.

The change requires a specific tool (spring bar tool) to remove the spring bars that secure the strap to the case lugs. Position the tool in the small slots of the bars, release the internal spring and extract the bar. Insert the new strap by aligning both sides on the bars and press until the safety click. If you prefer to avoid the risk of scratches, the Casati Milano atelier performs the change with custom supervision.

No. Although 20 mm is a standard measurement, compatibility depends on the type of case lugs of the specific Omega. The Constellation 123.20.31.20.08.001 has smooth and straight lugs, compatible with any standard 20 mm strap. However, construction quality (stitching, leather selection, finishing) varies enormously: bespoke straps from Milano Straps guarantee precise tolerances and materials certified to avoid stress on a 5000+ euro watch.

A quality alligator or calf strap, worn daily with proper maintenance (drying after accidental contact, avoiding direct heat), lasts between 3 and 5 years before requiring replacement. Vegetable-tanned leather ages gracefully: the patina that develops tells the story of use. A NATO strap lasts longer (5-7 years) thanks to robust canvas, but the leather webbing ages in parallel.