Strap for Constellation Co-Axial 35 Stainless Steel / Bronze

The lug width of the Constellation 123.10.35.20.10.001 is 22 millimetres. This width is standardized across all Constellation models in the 35mm contemporary series. To verify it, insert a calliper between the lug pin and the case wall, internal measurement. Any 22mm strap will fit without forcing.

It depends on usage and aesthetic preference. Cognac brown alligator offers formal elegance and complements the vintage-inspired design. Vegetable-tanned calf develops a natural patina that mirrors the aging of the steel. For sports contexts, FKM rubber guarantees durability and practicality without weighing down the 35mm wrist. NATO Cordura remains solid for outdoor-oriented variants.

The Constellation uses spring bars (movable lugs) that attach the strap to the case. To remove the strap: insert a flat tool (springbar tool) into the small hole on the upper part of the lug to compress the internal spring, pull the strap upward. Repeat the process on the opposite lug. To install the new strap, slide the spring bars into the lugs until you hear the spring click. Do not force: the spring bar must enter with light pressure.

Yes, provided it is designed for 22mm lug width. Any strap with the correct width will fit the case. However, we recommend verifying the spring bar thickness: it must range between 2.8mm and 3.2mm to ensure correct grip without slipping. Milano Straps artisanal straps are calibrated to this tolerance and include robust leather spring bars.

A quality leather strap (alligator or vegetable-tanned calf) lasts on average 3-5 years with moderate daily use. Durability depends on humidity, cleaning frequency and mechanical stress. Vegetable-tanned leather develops patina and stiffness over time; alligator maintains more stable elasticity. To extend lifespan: avoid prolonged humidity, clean with a soft dry cloth, apply leather cream every 6 months. Casati Milano straps include 18-month warranty on stitching and structure.