Best to avoid using the acronym "DDR" when talking about German coins. "DDR" means "East Germany" (Deutsche Democratische Republik) around here. 
Beginning in 1969, West German 2 mark coins, like this one, began to commemorate former West German Chancellors. This coin was indeed first issued in 1969, so in effect, the coin design originally commemorated the 20th anniversary of Konrad Adenauer's inauguration as Chancellor (he had died in 1967). But they decided to continue issuing the coins after 1969 (not entirely unlike how, in the US, the Washington quarter was originally intended to be a 1932 commemorative, but they decided to keep issuing them afterwards as the general coin design), and further, to expand the series to include other deceased West German politicians. This Adenauer design was issued from 1969 up to 1987, all bearing the "1949-1969" dates on the obverse and the "correct date" on the reverse.
And I can't really tell whether the doubling I'm seeing on the reverse is there, or just an artifact of the photograph - it's a little out of focus. But in any event, German collectors don't seem to be all that keen on doubling and similar varieties, in terms of actually paying lots of extra money for them.
Beginning in 1969, West German 2 mark coins, like this one, began to commemorate former West German Chancellors. This coin was indeed first issued in 1969, so in effect, the coin design originally commemorated the 20th anniversary of Konrad Adenauer's inauguration as Chancellor (he had died in 1967). But they decided to continue issuing the coins after 1969 (not entirely unlike how, in the US, the Washington quarter was originally intended to be a 1932 commemorative, but they decided to keep issuing them afterwards as the general coin design), and further, to expand the series to include other deceased West German politicians. This Adenauer design was issued from 1969 up to 1987, all bearing the "1949-1969" dates on the obverse and the "correct date" on the reverse.
And I can't really tell whether the doubling I'm seeing on the reverse is there, or just an artifact of the photograph - it's a little out of focus. But in any event, German collectors don't seem to be all that keen on doubling and similar varieties, in terms of actually paying lots of extra money for them.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis





















