Medal commemorating first free balloon stratospheric flight of Professor Auguste Piccard and Dr. Paul Kipfer
1931
1931
1935
1930
1935
circa 1930
1931
1935
1934
1929-1935
1931
1935
1932
1955; 1830
1934
1935
1932
1933
circa 1930
circa 1930
1934
1935
1932
2000-100 BCE
1930-1931
Before 1932
1934
1929-1935
1935
1933
1935
1934
1930
1930-1935
1933
1930 (replica); 1834 (original)
1935
1930
1935
1929
1935
1903 (original); 1982 (model)
1933
1933
1934
1990-96
1929
circa 1929
1934
1930
1930-1932