Strap for Constellation Co-Axial 35 Stainless Steel / Red Gold / Diamond / Brown

The lug width of the Constellation 123.25.35.20.63.001 is 18mm. This measurement refers to the distance between the two flanks of the case lug, where the strap is inserted. It is essential to verify this measurement before purchasing an aftermarket strap to ensure perfect alignment with the case.

Chocolate brown alligator is the most elegant choice, as it amplifies the dial's guilloché and pairs perfectly with the rose gold case. Dark brown vegetable-tanned calf is a more versatile and durable alternative, ideal for those seeking a natural patina over time. For a sporty look, black NATO fabric or technical rubber offer practicality without aesthetic compromise.

The Constellation features a strap mounted via spring bars (lugs) that insert into the case lugs. To remove the strap, use a spring bar tool to release the quick-release springs of the bars. Insert the tool into the dedicated slot on the side of the bar, push gently until you hear a click, then remove the strap. The operation takes just seconds; avoid hammers or improvised tools that could damage the rose gold.

Yes, any strap with 18mm lugs is compatible with the Constellation 123.25.35.20.63.001, however it is advisable to choose brands that respect the tolerance standard of ±0.1mm. Low-quality straps may have variations that create lateral movement or insertion difficulty. Milano Straps offers a curated selection of straps verified for this measurement, ensuring prescribed fit and durable materials.

A quality leather strap, such as vegetable-tanned alligator or tannic calf, lasts an average of 3-5 years with daily use and regular maintenance. Longevity depends on exposure to sun, humidity, sweat, and cleaning frequency. Alligator has greater resistance to environmental factors and can exceed 5 years. The natural oils in the leather wear over time: applying a leather balm every 6-12 months significantly extends the strap's lifespan and maintains its color.