I bought a folding kick lever for my Plunger A10 early '80's in the UK somewhere, and it has 'K CE10' and 'MCE' forged in it. Much chunkier than the other I have, and about a half inch shorter, but same profile. The cotter seems to work but I elected to use the one I had which isn't stamped 'BSA', but feels factory. I'll try add a pic sometime