this is the Seamaster Professional deployant clasp from the Ploprof 1200. No idea of it's age, but I used it for a big and chunky project watch and it does have some scuffs from wear, no gouges or dents/dings. I tried to photograph it in some harsh light to show condition more accurately. It will fit any setup that has 20mm spring bar ends. Last pictures show the leather setup I used. Microadjust and diver's extension working as they should.

Asking $250 CAD via transferwise/Wise or whatever that converts to in your currency.
Thanks OF for the space.