Strap for D-Star Chronograph Automatic

The lug width of the Rado Oval R15378159 is 18mm. This measurement is taken perpendicularly between the two lugs (the mounting points of the case). Any compatible strap must measure exactly 18mm wide to fit correctly on the spring bars without forcing or strain.

The ideal strap depends on intended use and aesthetic preference. An alligator in neutral tones (grey, taupe) enhances the geometric purity of the ceramic oval case. A calf leather in vegetable tanning with cognac colouring offers daily versatility and develops a natural patina over time. A grey-blue canvas NATO is the sportive choice. At Milano Straps, all three styles are available in 18mm, ready to ship.

The strap is changed using a spring bar tool—a small flat implement that compresses the spring bars (the internal metal springs within the lugs) to release the old strap and seat the new one. Position the tool in the vertical slot, compress gently, and slide the strap. If you lack this tool, our straps at Milano Straps ship with detailed instructions, or you may consult Casati Milano for guidance by appointment.

Yes, any strap with an 18mm lug width is physically compatible. Aesthetic compatibility, however, depends on personal taste. At Milano Straps, our 18mm straps are curated for visual harmony with watches sharing the oval case proportion: leather, NATO, and rubber options are available for diverse styling choices.

A quality calf leather strap in vegetable tanning has a durability of 3–5 years with regular wear (4–5 days weekly). Ageing is not degradation but patina development: the leather deepens in colour and gains character. Shell cordovan offers superior longevity, up to 7–8 years. In humid climates or with intense perspiration exposure, lifespan reduces. At Milano Straps, you can order replacement straps anytime to refresh your R15378159 styling.