Strap for Constellation Co-Axial 38 Stainless Steel / Yellow Gold / Silver Slik

The lug width of the Constellation 123.20.38.21.02.006 is 20 millimetres. This dimension is standard for the model and determines the compatibility of all aftermarket straps. To verify it, observe the horizontal distance between the two side lugs of the case: it must be exactly 20mm. Any strap with internal lug width space compatible with this measurement is suitable for your watch.

The best strap depends on intended use. For formal occasions, a black or dark brown alligator elevates the elegance of the gold and steel case. For daily wear, a vegetable-tanned calf leather offers robustness and a fascinating patina over time. If you seek versatility, a burgundy or cognac alligator works both day and evening. For those who love sportiness, a calf leather with satin finish in particular shades (slate blue, sage green) creates contemporary pairings.

Strap replacement requires specific tools: a spring bar tool and a light source for optimal visibility. Position the watch with the dial facing downward, locate the spring bar (the elastic pin) at 12 or 6 o'clock, gently press the tool toward the center to compress the internal spring, and remove the old strap. Repeat on the other side. Insert the new strap by aligning the lug holes with the pin, then gently compress until the retention click. If unsure, entrust the operation to a specialist.

Yes, the Constellation 123.20.38.21.02.006 accepts any strap with a 20mm lug width, provided the internal lug spaces are compatible with this measurement. Quality aftermarket straps, made from fine leathers such as alligator, calf or shell cordovan, do not compromise the value of the watch and indeed allow you to express versatility of use. On milanostraps.it you will find a selection of 20mm straps already verified for compatibility.

The lifespan of a leather strap depends on construction quality, material, and frequency of use. A handcrafted alligator or shell cordovan strap can last 3-5 years of intensive daily use, developing a fascinating patina over time. A vegetable-tanned calf leather, if properly maintained (dried after perspiration, stored in a dry place), easily reaches 4-6 years. High-quality rubber straps offer greater durability but less patina. Casati Milano provides an 18-month warranty and offers leather maintenance and regeneration services.