500 DDR mark banknote

500 DDR Mark and 200 DDR Mark: East Germany’s mysterious banknotes

During the last years of the Cold War, the East German state bank printed millions of 500 DDR mark and 200 DDR mark banknotes, but they were never put into circulation. What was the reason for this, and how come these banknotes are for sale on sites like Ebay? 

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