Strap for Constellation Manhattan 29 Co-Axial Master Chronometer Stainless Steel / Sedna Gold / Diamond / Blue Aventurine

The Omega Constellation 131.28.29.20.99.003 has a lug width of 18 millimetres. This specification is essential for selecting a compatible strap: the strap lug width must be exactly 18mm to fit correctly between the lugs of the case. Always measure with a digital calliper or rigid ruler, positioning the tool perpendicular to the case at the widest point of the lug width.

For this women's Constellation, we recommend a dark burgundy alligator strap or black calf leather for formal elegance. If you prefer a patina that develops over time, opt for vegetable-tanned leather in cognac, which creates a sophisticated contrast with Sedna gold. For sporty-elegant style, a bright rum-coloured cordovan shell strap enhances the rarity of the Sedna alloy. The choice depends on your wearing context: formal suggests alligator, everyday indicates calf, pure collecting recommends cordovan shell.

Changing the strap on the Constellation 131.28.29.20.99.003 requires a spring bar tool. Position the watch with the strap facing downward, insert the flat end of the spring bar tool into the lug slot and push upward to retract the spring of the bar, allowing the strap lug to slide out. Repeat on the other lug. Insert the new 18mm strap by aligning one lug first, then the other, ensuring the spring bar is correctly positioned. If you lack experience, a watchmaker can perform this operation in a few minutes.

Any artisanal strap with a lug width of 18mm is compatible with the 131.28.29.20.99.003. However, verify that the strap lug thickness (typically between 3.5 and 4.5mm) is not excessive, to avoid strain on the original lug. Milanostraps are manufactured according to watchmaking specifications and guarantee compatibility with precise tolerances. Avoid straps with excessive tolerances (beyond 18.2mm) that could create unwanted movement on the case.

A quality artisanal leather strap (alligator, calf, vegetable-tanned) worn daily lasts between 3 and 5 years before requiring replacement. Cordovan shell, thanks to the density of the leather, can last 7-10 years if properly maintained (conditioned with natural oils every 6-8 months). Lifespan depends on wearing intensity, exposure to moisture and perspiration, and stitching quality. Casati Milano vegetable-tanned straps develop a patina over time rather than degrading, acquiring aesthetic character; the 18-month warranty covers any manufacturing defects.