Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1926
1926
1930
1927
circa 1930
1931
1931
1932
1955; 1830
1932
1933
1927-1929
circa 1927
circa 1930
circa 1930
1934
1927
1932
before 1928
2000-100 BCE
1930-1931
Before 1932
1928
1927
1933
1926
1928
1928
1927
1930
1924
1927
1926
1926-1932
1933
1930 (replica); 1834 (original)
1930
circa 1927
1929
1903 (original); 1982 (model)
1933
1926-1928
1933
1990-96
1929
circa 1929
1926
1930
1930-1932