Strap for Divers Sixty-Five 40 Social Club Edition / Nuremberg

The lug width is 20 millimetres. This dimension is manufacturer-certified and represents the distance between the two horizontal pins connecting the lugs to the case. Aftermarket straps must be sized exactly at 20mm for correct insertion into the passants without forcing.

Strap choice depends on intended use: alligator with vegetable tanning for mixed contexts (diving + formal), developing patina over time; military nylon NATO for sandy or tactical diving; FKM rubber for pure diving, with guaranteed grip when wet and zero maintenance. The correct choice maintains the watch's functional identity.

Use a spring bar removal tool to gently depress the horizontal pin and free the lug from the old strap. Insert the new strap by aligning the passants with the holes and pushing the pin until it clicks into place. Verify the pin is fully seated on both sides. If the strap features a rotating bezel, avoid forcing during the change.

Yes, provided it is dimensioned exactly at 20mm lug width. Italian artisanal straps in alligator, shell cordovan, or calf leather offer superior quality and aesthetic evolution over time. Verify that the passants are calibrated for a 40mm case and that the strap supports weight and grip in marine environments if used for diving.

A leather strap with vegetable tanning (alligator, calf) on a diving watch lasts 3–5 years with regular use and proper maintenance: dry after each immersion, avoid prolonged direct sunlight, clean with soft brush and neutral soap. The patina that forms protects the fibres. With occasional use, lifespan may extend to 7–8 years. FKM rubber has indefinite life if stored away from ozone and intense UV rays.