Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
1916
circa 1920
circa 1900
after 1903
1935
1918-1922
1926
1930-1940
1948
1946
1955
1955
1943
1948
1920-1940
1901
1900-1950
1921
1900-1950
1900-1950
1926
1910-1936
1940-1944
1900-1950
1942
1898-1899
1896
1943
1910-1936
1925-1940
1900-1950
1900-1950
1910-1930
1930
1900-1909
1899
1903
1904
1900-1950
1901-1910
1915
1906
1930-1950
1900-1950
1945
1900-1950
1900-1950
1940