30 Pfg "European engineer-congress, Constance", type I = 1. printing, complete counter sheet to 50 values, A sheet No. 000070, date of printing 18.6.49, plate flaw I (field 19) and plate flaw II (field 25), in perfect condition mint never hinged, unsigned, photo expertize H. D. Schlegel BPP (2018) : "the quality is perfect. ", Michel 1.500.-