Strap for Constellation Co-Axial 27 Brushed Stainless Steel / Red Gold / Blue Supernova

The lug width of the Constellation 123.20.27.20.53.001 is exactly 16 millimetres. This measurement is specific to this reference and guarantees a precise fit between case and strap. To verify it, insert a digital calliper horizontally between the two lugs of the case and measure the internal distance: the value must be exactly 16mm.

For the Constellation in rose gold and steel, alligator in dark brown (espresso) or burgundy tones represents the optimal choice: the characteristic grain of the reptile amplifies the chromatic complexity of rose gold, while natural water resistance and longevity surpass other leathers. Alternatively, vegetable-tanned calf offers daily versatility and develops a patina over time. For casual sport contexts, a NATO strap in dense grey or black canvas works exceptionally well.

The change is straightforward if you possess the correct tools. You will need: a spring bar removal tool (Y-shaped or lever type), a soft cloth and patience. Position the watch face down, gently extract the pin from the first lug with a horizontal movement, remove the old strap, insert the new one between the lugs and reinsert the pin until it clicks into position. If you are unsure, entrust the task to a professional watchmaker to avoid scratches on the case.

Yes, any strap with a 16mm lug width is compatible. On milanostraps.it you will find a collection of 16mm straps in various materials (alligator, calf, shell cordovan, NATO) ready for shipment or customizable upon request at the Casati Milano atelier. Compatibility is guaranteed by lug width, not by original brand.

Duration depends on the material and usage. An alligator or shell cordovan strap, if well maintained, lasts 5–7 years of daily use before requiring replacement; vegetable-tanned calf lasts 3–4 years (but the patina it develops is part of its aesthetic value). A canvas NATO strap can last 2–3 years with continuous wear. Exposure to sunlight, perspiration and humidity accelerates wear. Proper maintenance (periodic cleaning, drying) significantly extends the lifespan of the strap.