Some people assume this to be a secondary mark of Rudolf Wächter from Kirchenlamitz, the letters "PMK" in that case standing for either "Porzellan-Malerei Kirchenlamitz" or "Porzellan-Manufaktur Kirchenlamitz". That is however pure guesswork and no evidence for this theory has been found so far.

M090609b
Crown above crossed swords flanked by the letters "PMK", all above "BAVARIA" and "HANDAUSGEMALT".