Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1911
1916
circa 1920
after 1903
1935
1918-1922
1926
1921
1926
1910-1936
1910-1936
1910-1930
1930
1903
1904
1915
1906
1927
1915
1915
circa 1905
1904-1914
1903
1935
1908
circa 1930
1918
1931
circa 1920
1915-1925
1920
1904
circa 1910
1914-1920
1935
1914-1918
1936
1920-1929
1934
1912
1929-1935
1906
1936
1931
1917
1909
1937
1937
1935