1948, 10 C. To 10 Fr. Aviation pioneer, variety \"unperforated\", complete set with ten values in mostly mint never hinged in outstanding quality, uniform right upper corners of the sheet, 10 Fr. Small embossed spots as well trace of crease in the margin of sheet, the rarest unperforated set Liechtensteins, unsigned with photo certificate Hoffner BPP \". Very rare. \" (Zst. F24-33 U)