1 Mark airmail 1922, variety \"without visible background\", in perfect condition mint never hinged, signed, photo expertize Dr. Oechsner BPP: \". Genuine and immaculate\", Michel 800.- - Michel number 215 F is rare! Last hammer price for a piece in same quality during of our 157. Auction = 410.- Euro! Could we since over 5 years no longer offer!