Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
1916
circa 1920
1889
circa 1900
1880-1920
after 1903
1935
1918-1922
1926
1880-1900
1901
1890-1899
1921
1877-1897
1926
1910-1936
1880-1920
1878-1890
1880-1890
1898-1899
1896
1880-1920
1879
1892-1920
1890
1910-1936
1890-1900
1878-1890
1910-1930
1930
1900-1909
1899
1860-1900
1878-1890
1860-1900
1860-1900
1903
1904
1860-1896
1901-1910
1915
1879
1906
1891-1920
1876
1878-1890
1878-1890
1878