Strap for Constellation Co-Axial 35 Stainless Steel / Diamond / Silver

The lug width of the Constellation 123.15.35.20.52.001 is 20mm. This measurement refers to the internal distance between the two terminals of the metal bracket attached to the case. It is essential to measure it correctly to ensure compatibility with any aftermarket strap. The 20mm represents a very common measurement in Swiss dress watches, allowing a vast selection of artisanal straps.

The best choice depends on use: vegetable-tanned alligator in cognac brown or black represents the formal upgrade, offering refined texture that complements the bezel lugs. For minimalist elegance, dark luxury calf develops a noble patina with aging. For sporty versatility, black or grey rubber keeps the Constellation functional in dynamic contexts. The 35mm case accommodates all these materials without compromising proportions.

The change is made by removing the metal lug from the case lugs using a dedicated tool (spring bar tool). Position the tool in the small groove under the lug, press laterally to release the pressure spring, then extract the lug. Insert the new strap by aligning the lug with the holes on the case, press until you feel the spring snap into place. Verify that the lug is secured on both sides before wearing the watch. Simple but delicate operation: we recommend having it done by a watchmaker if you are a beginner.

All straps with 20mm lug width are compatible. This includes alligator, calf, shell cordovan, NATO, rubber, and canvas. Milano Straps offers a complete collection of customizable 20mm straps, from artisanal solutions in fine leather to sporty models. Always verify that the lug is designed to attach via spring bar (pressure spring), the universal standard for this category of watches.

A quality alligator or calf strap, subject to regular maintenance, typically lasts 5-7 years of daily use. Lifespan depends on climate, personal perspiration, frequency of wear, and cleaning. In humid climates leather deteriorates faster; in dry environments it can last over a decade. Leather aging is not deterioration but rather patina development: a vintage strap can remain functional for 10-15 years. Milano Straps guarantees 18 months on all artisanal straps crafted at the Casati Milano atelier.