It is an overprint from the later period of inflation in the 1920s. 2 hundred marks would have seemed a crazy price for a postage stamp in 1920 but it had had to be overprinted for a value 500 times more. Things got even worse.
The stamp is a forgery. This error occurs on only one sheet of 100 stamps. On the genuine the overprint is not well-centered; it is to the left and to the bottom of the stamp.
The back of each stamp was double-signed by Dr. Gerhard Düntsch (BPP expertizer). Your stamp is likely not signed. There should also be an Attest (certificate) with the stamp.
Oberpostdirektion (OPD) was in Germany the name for a central authority and administrative unit of the postal administrations. Erfurt was just one of the towns.
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