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
after 1903
1935
1918-1922
1926
1930-1940
1892-1900
1920-1940
1886
1901
1890-1899
1890
1921
1926
1910-1936
1898-1899
1896
1892-1920
1890
1910-1936
1925-1940
1890-1900
1910-1930
1930
1900-1909
1899
1903
1904
1901-1910
1915
1906
1891-1920
1940
1927
1938
1915
1895
1915
circa 1905
1904-1914
1903