Strap for Constellation Co‑Axial Master Chronometer 27 Small Seconds Stainless Steel / Diamond / MOP

The lug width of the Constellation 127.15.27.20.55.001 is 17mm. This measurement refers to the internal distance between the two holes where the spring bars pass through. It is essential to measure it correctly before ordering an aftermarket strap: position a ruler perpendicularly on the case, inside the lugs, and you will find exactly 17mm. All compatible straps must respect this measurement to ensure secure fit.

Alligator in brown or cognac tones is the most elegant choice for the Constellation 127.15.27.20.55.001, thanks to its natural texture that creates contrast with the polished steel case. Alternatively, vegetable-tanned European calf offers softness and an evolving patina over time. For absolute durability, shell cordovan is unparalleled. The choice depends on use: formal and daily wear = alligator; versatile and dynamic = vegetable-tanned calf; intense activity = shell cordovan. All available in 17mm size.

Strap replacement requires a specific tool (spring bar tool) to remove the spring bars from the lug holes. Position the watch on a soft surface, insert the tool tip into the hole, gently push to extract the spring bar, and remove the old strap. Repeat from the opposite side. To install the new strap, align the holes, reinsert the spring bars, and verify the fastening by pulling gently. If you are unsure, contact an authorized Omega service center or Casati Milano atelier for professional installation.

Yes, all aftermarket straps in 17mm lug width are compatible with the Constellation 127.15.27.20.55.001. On milanostraps.it you will find a wide selection of artisanal straps in alligator, calf, shell cordovan, rubber and fabric, customizable in length and color. The important thing is to respect the 17mm lug width and verify that the spring bars are the correct size. Casati Milano custom straps offer perfect adjustment and 18-month warranty.

A quality leather strap (alligator, vegetable-tanned calf or shell cordovan) for moderate daily wear lasts on average 2-4 years before requiring an aesthetic change. Longevity depends on wear, humidity, frequency of wear and leather quality. Alligator is particularly resistant thanks to the natural scale structure. Casati Milano custom straps are made with premium leathers and mounted with hand-stitching, extending durability beyond 4 years. With proper care (avoiding excessive moisture and periodic cleaning), the strap remains functional with a beautiful aging patina.