Strap for Seamaster Planet Ocean 600M Co-Axial 42 Mécanique 6 Sapphires

The lug width is 20 millimetres. This measurement is essential when purchasing a compatible strap: it is measured from the inner left wall to the inner right wall of the lug, excluding the outer edges. A 20mm lug width ensures correct visual proportioning on a 42mm case while maintaining structural integrity for marine use.

For this model we primarily recommend alligator leather in cognac brown or black colourway: the regular grain pairs perfectly with the mother-of-pearl dial, and the leather possesses natural moisture resistance. A valid alternative is high-quality calf in matte black with white stitching, which develops patina over time. For frequent marine use, vulcanised rubber in black or dark blue offers functionality without aesthetic compromise.

The 2916.50.38 features fixed soldered lugs (non-removable). Strap changing involves tilting the spring bar inside the lug using a dedicated tool (spring bar tool), extracting the metal bar from its seat and lifting the strap. The new strap is inserted by realigning the spring bar into position, allowing the bar to snap into the opposite lug cavity. This is a delicate operation: we recommend entrusting it to experienced personnel for your first attempts.

Yes, provided the strap has a 20 millimetre lug width. Quality artisanal aftermarket straps (such as those made by Casati Milano) are fully compatible and often allow customisations impossible on the OEM market: choice of leather, colour, stitching and measurements specific to your wrist.

Durability varies significantly based on material, frequency of use and environmental conditions. A certified quality alligator or calf, used under normal conditions (without prolonged submersion), maintains structural integrity for 5–7 years. If frequently exposed to saltwater, durability reduces to 2–4 years. Vulcanised rubber resists longer in humid environments, up to 8–10 years. Regular maintenance and drying after water contact significantly extend useful life.