Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
1916
circa 1920
circa 1900
after 1903
1935
1918-1922
1926
1930-1940
1920-1940
1901
1921
1926
1910-1936
1898-1899
1910-1936
1925-1940
1910-1930
1930
1900-1909
1899
1903
1904
1901-1910
1915
1906
1940
1927
1938
1915
1915
circa 1905
1904-1914
1903
1940
1938
1938
1938
1935
1938
1908
circa 1930
1940
1900-1920
1918
1931
1901
1902
circa 1920