Strap for Seamaster Planet Ocean Ultra Deep O-Megasteel / White / Bracelet

The lug width of reference 215.30.46.21.04.001 is 22mm, measured between the case lugs. This dimension is standard for the 45.50mm model and ensures proper visual proportion between the large case diameter and strap development on the wrist.

Dark brown alligator or Tuscan vegetable-tanned leather are privileged choices for this model. Alligator catches light with natural grain, creating contrast with the black ceramic bezel; vegetable-tanned leather imparts gravitas without heaviness. For sport contexts, black FKM rubber is ideal to amplify the technical vocation.

The strap is changed by gently removing the spring bars that connect the case to the strap. Use a dedicated spring bar tool to push inward the retention mechanism of one spring bar at a time, sliding it out. Insert the new spring bar into the lug of the new strap and reinsert it into the case housings, ensuring it clicks into position.

Yes, provided it is declared for 22mm lug width. On milanostraps.it all straps in our collection for 22mm lug width are tested for mechanical compatibility. If you desire absolute certainty, contact Casati Milano atelier via WhatsApp to verify visually before ordering.

A quality natural leather strap (alligator, calf) typically lasts 3-5 years with proper maintenance. However, a watch destined for frequent underwater use entails greater humidity: we recommend alternating the leather strap with a rubber one during summer periods or intensive water use. Casati Milano's 18-month warranty covers manufacturing defects independent of use.