Starting with the 1 Pf. in 1960, followed by the 10 Pf. in 1963, and the 5 Pf. in 1968, the old style coins were gradually replaced with new coins depicting the state name "Deutsche Demokratische Republik." Aluminium 1 Mark, 2 Mark and 50 Pfennig pieces were released for circulation in 1956, 1957 and 1958, respectively. In 1969, brass 20 Pfennig coins were introduced, with nickel-bronze (later cupro-nickel) 5 Mark coins issued from 1968. In 1973 and 1974, 1 and 2 Mark coins were redesigned dropping the former "Deutsche Mark" title. The brass 20 Pfennig coins were issued partly because pay telephones had a standard charge of 20 Pf. and were having problems with smaller aluminium coins jamming due to their light weight. Commemorative 5, 10, and 20 Mark coins of various types have also occasionally made it into circulation.
Various combinations that could be considered politically unacceptable – mainly due to implications relating to Nazi Germany – are disallowed or otherwise avoided.  The district Sächsische Schweiz used the name of its main town, Pirna, in its code PIR , to avoid the use of SS , the name of the paramilitary organization; similarly SA is also unused. Although between 1945 and 1949 the French occupation force used the combination SA followed by the double-digit numbers 01 to 08 for the then seven rural districts in the Saar Protectorate and its capital Saarbrücken . In 2004 in Nuremberg , a car owner was refused a number plate beginning N-PD because of the connection to the political party the NPD . [ citation needed ] The combinations STA -SI, HEI -L, IZ -AN and WAF -FE are also avoided, to avoid association with Stasi , the Nazi salute , NAZI backwards and the German word for weapon respectively.