Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Sedna Gold / Aventurine

The lug width (misura ansa) of the Omega Constellation 131.53.29.20.53.003 is 18 millimetres. This measurement uniquely identifies the strap compatibility with the case. To verify it, measure the distance between the two metal pins (lugs) positioned at the extremities of the case: this is the space where the strap is inserted. All aftermarket straps for this model must respect this measurement to ensure correct fit.

The best strap depends on context of use. For formal and elegant daily occasions, we recommend dark brown or black alligator: the natural scute texture contrasts pleasantly with Sedna Gold, offering durability and a professional patina. For those seeking authenticity and aesthetic evolution over time, vegetable-tanned calf develops a natural patina that accompanies the ageing of the alloy. Shell cordovan represents the ultimate premium choice, with natural lustre and dense fibre. For casual use, solid-colour calf leather in brown or grey offers versatility without aesthetic compromise.

Strap replacement requires two small screwdrivers or a dedicated strap removal tool. Place the watch on a stable, protected surface. Locate the lateral pins (lugs) connecting the strap to the case. Insert the screwdriver into the small hole beside the pin, apply gentle downward pressure to release the pin, which will retract into the case. Repeat for both sides. Remove the old strap and insert the new one by aligning the holes with the pins, then press until the click indicates secure fastening. Verify the strap is properly secured before wearing.

Yes, all aftermarket straps with an 18-millimetre lug width are compatible with the Constellation 131.53.29.20.53.003. MilanoStraps offers a complete collection of 18mm straps in alligator, calf, shell cordovan and other premium materials, customisable in measurements, initials and stitching thread. For those seeking a more refined experience, the Casati Milano atelier (by appointment) creates bespoke straps with personalised leather selection and direct WhatsApp updates, ensuring uncompromising artisanal quality.

The lifespan of a leather strap depends on the material, tanning process and intensity of use. A quality alligator strap, subject to moderate daily use and proper maintenance (protection from excessive moisture, quick drying after perspiration), typically lasts 3–5 years before replacement. Vegetable-tanned calf has similar durability but develops a captivating patina over time. Shell cordovan, thanks to fibre density, can last 7–10 years. To extend strap life, avoid prolonged water exposure, protect from direct light when stored, and consider treatments with leather-specific protective creams. Casati Milano provides an 18-month warranty on all straps handcrafted in the atelier.