1936
1935
1940
1934
2000-100 BCE
1939
1938
1955; 1830
1937-1938
1938 and 1951
1937-1937
1938-1940
1990-96
1986 (replica); 1501-1600 (original)
circa 1940
1937
circa 1939
1801-1892 (prepared); 1946 (element replaced)