Strap for Seamaster Planet Ocean 600M Co-Axial 45.5 Master Chronometer Chronograph Stainless Steel / Beige / Rubber

The lug width is 22mm, measured between the inner edges of the case lugs. This width is structural to the model and does not vary between examples: it provides visual balance between the 45.50mm case and a proportionate strap, maintaining aesthetic versatility between formal elegance and sport-diving use.

For formal wear, alligator or vegetable-tanned calf in brown or midnight blue tones offer elegance and fascinating aging. For active diving, EPDM rubber or FKM elastomers guarantee resistance to salt and chlorine. Shell cordovan represents the ultimate investment: it ages developing extraordinary patina and progressively more robust fibers over decades.

Place the watch on a soft pad, use a springbar removal tool to extract the lugs (small metal plungers that secure the strap). Gently compress the spring and slide the lug out of its housing. Insert the new strap by reversing the process: the spring must enter the housing correctly with a slight click of engagement.

Yes, provided it is truly 22mm measured between the inner passants and the passant depth is compatible (approximately 4.8mm for this model). Always verify specifications with the manufacturer: tolerances of ±0.2mm are common, but fitting a strap with undersized passants creates excessive play and instability.

With moderate use and leather at least 1.8mm thick, a quality strap has a lifespan of 3-5 years before replacement. The 196-gram case generates significant torsional stress on the passants: thin leathers fail prematurely. Vegetable-tanned leather ages progressively, developing patina, but maintains a ten-year structure if periodically cared for with natural wax.