Strap for Seamaster Planet Ocean 600M Co-Axial 39.5 Master Chronometer Stainless Steel / White / Bracelet

The lug width of the Seamaster Planet Ocean 215.30.40.20.04.001 is 19 mm. It is measured internally, from inner edge to inner edge of the slot where the strap is inserted. This is a specific dimension of this 39.5 mm version and is not compatible with 18 mm or 20 mm straps.

It depends on usage and personal preference. Natural brown or black alligator offers formal elegance and perfect contrast with steel; vegetable-tanned calf develops patina over time; FKM rubber is ideal for actual diving and sport contexts. For the blue dial of this version, we recommend dark alligator or cognac calf.

Position the watch with the case horizontal. Use a spring bar tool (two-pronged instrument) to gently compress the spring bars at the ends of the case. Lift the old strap and remove the bars. Insert the bars into the new strap, aligning them perfectly on both lugs, then lower the strap until it clicks into place. Repeat on the other side.

Yes, provided it is 19 mm lug width. milanostraps.it offers a specialized collection of handcrafted 19 mm straps compatible with this model, in alligator, calf, shell cordovan, rubber and textiles. All are tested for tolerance and mechanical compatibility.

A high-quality leather strap made with vegetable tanning has an average lifespan of 3-5 years under daily wear. Factors such as humidity, sun exposure, sweat and maintenance affect longevity. Casati Milano guarantees 18 months on custom straps and recommends periodic maintenance (cleaning and conditioning) to extend useful life.