The complete set in detail

ES43
Mi.Nr. B.I
1957 - Official stamp : Inscription 'DDR' overprinted 'Zentraler Kurierdienst', watermark 'DDR and flowers' - 10 Pfg. ; lilac and black

ES44
Mi.Nr. B.II
1957 - Official stamp : Inscription 'DDR' overprinted 'Zentraler Kurierdienst', watermark 'DDR and flowers' - 20 Pfg. ; lilac and black