Strap for Constellation Co-Axial 38 Stainless Steel / Black

The lug width of the Constellation 123.10.38.21.01.001 is 18 millimetres. This lug width is standard for 38mm cases and is determined by the distance between the internal case attachments. It is essential to measure it with a digital calliper perpendicular to the case to exclude 16mm or 20mm straps, which will not fit correctly.

The best strap depends on the intended use and dial. For formal elegance, we recommend a medium brown alligator or vegetable-tanned calf leather. For sports or winter versions, black shell cordovan or FKM rubber offer superior water resistance. Teak or cognac alligator emphasises the classic character without excess, maintaining everyday versatility.

The strap is changed using a spring bar removal tool: position the tool under the lug attachment, apply gentle upward pressure to compress the spring bar, then remove the old strap. Insert the new strap by guiding the spring bar into position until you feel a perceptible click. It is advisable to proceed with caution to avoid scratching the steel case.

Any strap with an 18mm lug width is compatible with the Constellation 123.10.38.21.01.001. Online you will find customisable straps from specialist brands with finishes in alligator, calf, shell cordovan and rubber. Ensure the width is exactly 18mm and that the strap is as robust as the coaxial movement of the watch.

A quality leather strap lasts an average of 2-5 years with daily use, depending on the tanning method and environmental conditions. Vegetable-tanned leather offers greater longevity (5-8 years) compared to chemical finishes. Natural ageing develops a patina that harmonises with the steel case, adding character. Regular maintenance and protection from moisture significantly extend the lifespan.