Strap for Constellation Co-Axial 31 Stainless Steel / Yellow Gold / Champagne Supernova

The lug width of the Constellation 123.25.31.20.58.001 is 18 mm. This dimension is specific to this model and requires dedicated 18 mm straps, not compatible with universal 20 or 22 mm standards. Verify by measuring the internal distance between the two lugs: it must be exactly 18 mm.

For this two-tone gold and steel model, we recommend fine-grained African alligator in medium brown or tobacco tones, which amplifies the chromatic contrast with the case. Alternatively, vegetable-tanned calf for a softer patina over time, or shell cordovan for greater durability. We advise against fabric or rubber straps as they would compromise the formal character of the instrument.

Strap replacement requires a removable spring bar tool. Gently insert the flat blade under the internal spring of the lug, compress the spring, and slide the lug outward. Reverse the procedure for the new strap, ensuring the lugs click correctly into position. If you are not experienced, rely on the Casati Milano atelier for professional replacement.

Yes, if the lug width is 18 mm. MilanoStraps 18 mm straps have been tested on Constellation and similar models. During checkout, specify that it is for a Constellation with 18 mm lug width. If in doubt, contact the Casati Milano atelier via WhatsApp for advance verification.

An artisanal alligator or calf strap lasts an average of 3-5 years with daily use, depending on climate, humidity, and personal care. Shell cordovan can last up to 7-8 years due to the density of the leather. The standard MilanoStraps warranty is 18 months; subsequent deterioration depends on natural wear. Store the strap away from direct light and extreme humidity.