Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
1916
circa 1920
circa 1900
1899
after 1903
1935
1918-1922
1926
1928
1926
1911
1901
1901
1921
1926
1910-1936
1932
2000-100 BCE
1906-1915
1901-1930
1900-1910
1900-1910
1901-1930
1920-1928
1925
1910-1936
1921-1926
1934
1936
1900-1909
1902-1907
1935
1899
1935
1922-1923
1920-1936
1900-1920
1917-1918
1910-1930
1930
1902-1923
1900-1909
1922-1923
1899
1901-1929
1903
1924
1904