The German currency has changed over time. The Reichsmark (10 letters) was the currency of Germany from 1924 to 1948. The MARK (4 letters) was the currency of Germany from 1871 to 1924. The Pfennig (7 letters) was the subunit of the MARK and was used until the introduction of the Euro (4 letters). The Deutschmark (11 letters) was the currency of Germany from 1948 to 2002, when it was replaced by the Euro.