The complete set in detail

ES34
Sc Nr. O28
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 5 Pfg. ; yellow-black

ES35
Sc Nr. O29
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 10 Pfg. ; yellow-black

ES36
Sc Nr. O30
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 20 Pfg. ; yellow-black

ES37
Sc Nr. O31
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 40 Pfg. ; yellow-black

ES38
Sc Nr. O32
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 70 Pfg. ; yellow-black