Most of mine are num 700 or 755 locks - so common they are silly, but I think I still have two machines with original keys and two with no lock... they are the most recent acquisitions and are just waiting for my next parts order. Keep all the keys neatly lined up on a window sill in the gameroom.
-Rob
-visit http://www.kahr.us to get my daughterboard that helps fix WPC pinball resets or for my Pinball 2000 H+V video sync combiner kit