German Occupation of Bohemia & Moravia, 1939, Maehrisch-Ostrau, 50h to 20K Airpost issue of Czechoslovakia overprinted "Wir sind/frei!/ (S. Very rare complete set of this Occupation issue, post office fresh with crisp colors and flawless gum, all perf 13¾ except 20K perf 12½, o.g., never hinged, overall Very Fine; with 2002 Paetow certificate. Michel No. 20-27B  €3,080 ($4,220). $0 (Image)