Lot 51555 – 1870-1969, BALLOON MAIL Specialised group of 81 covers

1870-1969, BALLOON MAIL Specialised group of 81 covers and cards, mostly Poland showing a wide range of flights from mainly the 1930s, noted 1938 Stratospheric flight with min.sheet, several October 1926 flights (Swizlocz, Kleszczele, Siematycae, Warsaw), 1936 Sanok flights, 1935 Moscice flights, several 1935 Gordon Bennett flights plus a range of vignettes, also small exhibition collection mounted on 55 pages showing extensively balloon flights between 1958 and 1969