According to the Airmail labels catalog these were
"Issued by C.Ziesing, a stamp dealer at Karl-Marx-Stadt for the 'Esperanto-Gruppe im Deutschen Kulturbund"
There were two issued and apparently one was a misprint.
Year: 1969, gummed.
GDR-C-4, misprint, aerposta
Year: 1969, gummed.
GDR-C-5
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