The complete set in detail

ES34
SG No. EO257
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 5 Pfg. ; yellow-black

ES35
SG No. EO258
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 10 Pfg. ; yellow-black

ES36
SG No. EO259
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 20 Pfg. ; yellow-black

ES37
SG No. EO260
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 40 Pfg. ; yellow-black

ES38
SG No. EO261
1956 - Official stamp, for international use : Numeral, watermark 'DDR and posthorn' - 70 Pfg. ; yellow-black