Strap for Constellation Co-Axial 27 Brushed Stainless Steel / Black Supernova

The lug width of the Constellation 123.10.27.20.51.001 is 20mm. This measurement represents the distance between the lug attachment points on the case and determines compatibility with aftermarket straps. For accurate measurement, use a digital caliper positioned between the lug shoulders, excluding the lug curvature itself.

For the 27mm Constellation, we recommend an alligator leather strap with vegetable tanning in cognac or black tones, which enhances the watch's classical vocation. Alternatively, shell cordovan offers superior durability and a patina that develops over time. For sports use, a grey or blue textile NATO strap provides versatility while maintaining the formal elegance of the case.

To change the strap, first remove the watch from your wrist and position the case facing upward. Using a thin springbar tool, gently press the lug spring from the underside to disengage it from its seat, then slide the old strap out from the lugs. Insert the new strap by aligning the holes with the lugs, press with the spring until you hear a click, and verify that the strap is securely fastened on both sides.

Any strap with a 20mm lug width is compatible with the Constellation 123.10.27.20.51.001. We recommend choosing certified quality leathers (alligator, shell cordovan, vegetable-tanned calf) from specialist manufacturers that guarantee precise tolerances. Milano Straps offers a complete collection of customizable 20mm straps in various sizes, materials, and stitching details.

A quality leather strap with vegetable tanning and artisanal construction typically lasts 3-5 years with regular daily use. Durability depends on exposure to moisture, perspiration, and cleaning frequency. Shell cordovan, thanks to its superior density, extends the lifespan to 7-10 years. Factors such as buckle type (deployant or pin) and periodic maintenance significantly influence strap longevity.