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
1918-1922
1926
1901
1921
1926
1898-1899
1896
1910-1930
1930
1900-1909
1899
1903
1904
1901-1910
1915
1906
1927
1915
1895
1915
circa 1905
1904-1914
1903
1908
circa 1930
1900-1920
1918
1931
1901
1902
circa 1920
1915-1925
1920
1904
circa 1910
1914-1920
circa 1900
1914-1918
1920-1929
1912
1906
1898
1902
1901