Strap for Seamaster Planet Ocean 600M Co-Axial 45.5 Chronograph Stainless Steel / Diamond / Black / Alligator

The lug width measures 22mm. This dimension is specific to the 45.5mm model and represents the optimal compromise between structural rigidity and wrist comfort. The measurement is taken at the narrowest point of the lug, which is the space between the threaded attachments under the case.

For this 45.5mm diver with black dial and rose gold applications, we recommend alligator with vegetable tanning in dark mocha tone, vintage cognac calf, or shell cordovan with titanium deployant. For intensive underwater use, vulcanized natural rubber eliminates any water absorption. The choice depends on the desired balance between formal aesthetics and professional function.

The attachments on the Seamaster 232.18.46.51.01.001 are threaded. Using a dedicated watch tool (spring bar tool or replacement rod), gently unscrew the attachments counterclockwise until they loosen completely. Remove the old strap, clean the threads and case tube, then insert the new strap ensuring that the shoulders seat coplanar with the case profile. Tighten with controlled pressure, without exceeding.

Yes, any strap with a 22mm lug width is mechanically compatible. However, verify that the shoulder profile of the strap fits perfectly with the contour of the steel case: on a diver of this category, coplanar contact is essential to ensure both safety and aesthetics. Milano Straps are manufactured with tight tolerances for this measurement.

Durability depends on the quality of the tanning and the environment of use. An alligator or calf with supreme vegetable tanning, used occasionally or in dry environments, maintains functionality and aesthetics for 5-7 years. With frequent use or repeated immersions, the leather requires periodic maintenance (hydration, UV protection) to extend its life. Milano Straps offers replacement and repairs with 18-month warranty, including evaluation of patina development over time.