These official issues are overprints of regular Reichspost Issues MiNr. 241, 243, 244, 269-272, 322-323, and 326-330.
They were valid from the end of May 1923, until 30 September 1923 (MiNr. 75-77), 30 November 1923 (MiNr. 78-81), and 31 December 1923 (MiNr. 82-88).