1948, 10 C. To 10 Fr. Aviation pioneer, variety \"unperforated\", complete set with ten values in mint never hinged in outstanding quality, uniform left upper corners of the sheet, 10 Fr. Trace of crease in the margin of sheet, outside of the stamp design, the rarest unperforated set Liechtensteins, unsigned with photo certificate Hoffner BPP \". Very rare. \" (Zst. F24-33 U)