Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
1927
1916
circa 1920
circa 1900
1898
1899
after 1903
1918-1922
1926
1928
1926
1911
1901
1901
1921
1926
1894-1904
1894
2000-100 BCE
1906-1915
1894-1904
1895-1910
1901-1930
1898-1899
1900-1910
1896
1900-1910
1894-1904
1901-1930
1920-1928
1925
1894-1904
1921-1926
1900-1909
1902-1907
1894-1904
1899
1922-1923
1900-1920
1917-1918
1898
1910-1930
1930
1902-1923
1900-1909
1922-1923
1899
1901-1929