It is still possible to exchange Deutsche Marks (commonly known in English as Deutschmarks and in German as D-Marks or Marks) for euros at Germany's central bank, even though the currency has not been used for 18 years.
Can you still exchange German Deutsche Marks?
You can exchange unlimited amounts of Deutsche Mark banknotes and coins indefinitely and free of charge at all Bundesbank branches (information about the branches can be found at the link below).
Can I exchange old Deutsche Marks?
Although German mark notes and coins are no longer legal tender, most of those issued after June 20, 1948 can be exchanged for the equivalent value in euro at Deutsche Bundesbank branches or by post.