P_172a= dated June 30, 1969
P_172b= dated October 28, 1975, serial number varieties ~ sorszám különbségek
P_172c= dated September 30, 1980
P_172as, bs, cs = MINTA (specimen) overprint ~ MINTA felülnyomat

PNL ~ Pick Nem Jegyzi
P_172a test print ~ próbanyomat (see below)