The Deutsche Mark, abbreviated "DM" or "D-Mark", was the official currency of West Germany from 1948 until 1990, and then unified Germany from 1990 until the adoption of the euro in 2002. In English,
Obverse view of the 2001 special gold issue of the DM1 coin
One Deutsche Mark (1948), first series, Allied military issue
The penalty for counterfeiting and forgery of banknotes (imprisonment at least two years) appeared on the upper right corner of the reverse of all third series banknotes. Note this is the post-1970 variant, featuring "Freiheitsstrafe" ("imprisonment") instead of "Zuchthaus" (roughly "hard labour prison").
Banknote mit dem Nominalwert 10 Deutsche Mark, Wertseite, ausgegeben 1980
The East German mark, commonly called the eastern mark in West Germany and after reunification, was the currency of the German Democratic Republic. Its ISO 4217 currency code was DDM. The currency was
Deutsche Mark
…Deutschmark and free-ranging prices were accepted by the population. In the Soviet occupation zone of Germany (later the German Democratic Republic), the East German mark (also named "Deutsche Mark" from 1948 to 1964 and colloquially referred to as the Ostmark—literally Eastmark) was introduced a few days afterwards in…
Unloading sacks of coins from the Staatsbank for destruction, 1990
DM 1 from the 1948 Eastern series