Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
circa 1890
circa 1890
1916
circa 1890
circa 1920
circa 1890
1889
circa 1900
1880-1920
after 1903
1918-1922
1926
1862
1884
1892-1900
1880-1900
1880-1900
1886
1901
1890-1899
1890
1921
1877-1897
1926
1880-1920
1878-1890
1880-1890
1898-1899
1896
1880-1920
1879
1892-1920
1890
1890-1900
1878-1890
1910-1930
1930
1900-1909
1899
1878-1890
1903
1904
1901-1910
1915
1879
1906
1891-1920
1876