60 C dark yellowish red airmail issue 1932, 50 C dark brownish red vertical pair and single stamp airmail issue 1934 (reprinted issue), 90 C dark red referendum 1935 on properly franked airmail letter to Leopoldville / Belgian-Congo (Sabena first flight Brussels - Belgian-Congo), the upper stamp of the 50 C pairs has the plate flaw "dot besides right lower five-sided figure, small line underneath of the outer frame to the right of aerial" (position 1), the 60 C stamp point at the plate flaw "line between left bicycle and left Deceit area of the aircraft" on (position 23), franking rarity and rare destination, signed Hoffmann BPP, photo expertize Christian Geigle BPP "the single stamp Michel number 126 II and the Michel number 158 III are slightly yellow blotchy, otherwise is the quality perfect.