Strap for Seamaster Planet Ocean 600M Co-Axial 45.5 Master Chronometer GMT Deep Black Sapphire

The lug width of this model is 22 mm, measured as the internal distance between the lugs on the case. This measurement is specific to the larger diameter Seamaster Planet Ocean models (45.50 mm) and is not compatible with other references in the Omega family. To verify strap compatibility, measure the internal space between the lugs: it must be exactly 22 mm.

For this variant in black ceramic and platinum, we recommend ebony black alligator, which amplifies luxury elegance without competing with the case. An excellent alternative is Tuscan calf in cognac for those seeking material contrast, or anthracite FKM rubber to emphasize the model's aquatic vocation. Vegetable-tanned leather in aged dark brown offers a patina that evolves naturally over time.

Position the watch with the dial facing downward. Use a spring bar tool (a specialized tool with two pointed ends or side buttons) to push inward the end of the lug spring. Once the spring is compressed, remove the lug from the case. Repeat the procedure for the other side. Insert the new strap by aligning the attachments with the lugs, then snap the springs into place. Always verify that both sides are securely fastened before wearing the watch.

Yes, you can use aftermarket straps with 22 mm lug width, provided they are made to quality construction standards. Milano Straps offers artisanal straps in alligator, calf, and vegetable-tanned leather, customizable in sizes, initials, and stitching type. The Casati Milano atelier also allows custom strap creation with personal leather selection and an 18-month warranty.

Durability depends on leather quality and maintenance level. A high-quality artisanal alligator or calf strap, such as those offered by Milano Straps, has an estimated lifespan of 3 to 5 years with intensive daily use, up to 7-10 years with moderate use and regular care. Vegetable-tanned leather ages beautifully, creating a unique patina. Avoid prolonged humidity exposure and periodically treat with natural waxes to preserve leather flexibility.