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

The lug width of the Constellation 123.20.38.21.02.004 is exactly 20 millimetres. This width corresponds to the compact proportions of the 38mm case and has been maintained faithful to the historical design of the collection. You can verify it by positioning a digital calliper between the attachment points of the spring bars on the case lugs. Only 20mm straps will guarantee correct insertion and aesthetic continuity with the watch body.

Brown alligator or dark brown remains the most conservative and versatile choice, as the natural grain respects the understatement of the bi-metal case. If you prefer natural ageing, vegetable-tanned calf develops a rich tobacco patina over time, creating a fascinating dialogue with the Sedna Gold. For absolute luxury, shell cordovan guarantees legendary durability and deep patina over decades. A black rubber strap with deployant clasp allows sporty versatility without elegant compromise.

Use a spring bar tool (small spatula-like instrument), available on milanostraps.it. Position the tip in the groove of the case lug, beneath the spring bar, and apply gentle pressure inward to release the bar. Once free, extract the old strap. Insert the new spring bars into the slots, ensuring that the horizontal position is perfect and that the bar clicks definitively when you release it. Repeat for the opposite lug. The process takes three minutes and requires no special skill.

Yes, as long as the lug width is exactly 20 millimetres. Aftermarket straps of artisanal quality, such as those produced by Casati Milano for milanostraps.it, often offer superior finishes and materials compared to original Omega straps, allowing you to personalise your watch according to your taste. Always verify the compatibility certificate provided by the manufacturer and choose leathers and colours that respect the formal and bi-metal tone of the case.

Durability depends on the material and use. A quality artisanal alligator or vegetable-tanned calf strap, worn daily in normal conditions, lasts 2–3 years before the inner underside needs replacement. Shell cordovan, if properly cared for, lasts 5–7 years or more. Factors such as humidity, sweat, and direct sun exposure accelerate wear. A rubber strap has similar durability but degrades differently: rubber tends to stiffen rather than harden like leather. Casati Milano offers an 18-month warranty on all artisanal straps, including repairs to the spring bar assembly.