12 Pfg and 24 Pfg worker with ribbon type overprint, Munic postal forgery, impeccable mint never hinged. During the validity period of the stamps (1948) sheets of 12 Pfg and 24 Pfg were fraudulently printed row by row by the counterfeiter with imitated ribbon imprints to the detriment of the Postal Service. Expertized H. G. Schlegel BPP with photo certificate copy (for former block of four), Michel 800.-