Strap for Seamaster Planet Ocean 600M Co-Axial 39.5 Master Chronometer Stainless Steel / Diamond / Black / Alligator

The Seamaster Planet Ocean 215.18.40.20.01.001 features an 18-millimeter lug width. This measurement is determined by the proportion of the 37.50 mm case and ensures optimal visual harmony on the watch. To verify your strap's compatibility, measure the distance between the metal lugs on the case where the strap attaches.

The choice depends on the intended use. For elegant everyday wear, grey tortoiseshell alligator or full-grain leather create an impeccable aesthetic balance with the Seamaster blue dial. For more sporty applications or humid environments, vulcanized rubber or Tropic maintains the original diving functionality. Every strap must feature an 18 mm lug width to ensure compatibility.

The process is straightforward: obtain a spring bar tool (a small implement with two curved tips). Position one tip on each side of the spring bar that holds the strap to the case lugs, pushing inward gently. The spring will compress and the strap can be removed. Reverse the procedure to install the new 18 mm strap, ensuring the spring bar clicks fully at both ends.

Yes, all straps with an 18 mm lug width are compatible with the Seamaster Planet Ocean 215.18.40.20.01.001. What matters is that the strap is properly constructed with precise holes for the spring bars. Artisanal straps in full-grain leather, alligator, or rubber from specialized suppliers such as Casati Milano guarantee flawless construction and certified compatibility.

The lifespan of a leather strap depends on daily use and tanning quality. A high-quality alligator or calf leather, with vegetable tanning, maintains its structural characteristics for 18-24 months of daily wear. Leather subjected to frequent immersion in fresh or salt water will degrade more rapidly; in these cases, it is advisable to alternate straps or choose Tropic rubber. Regular maintenance (gentle cleaning and drying) significantly extends durability.