1934
2000-100 BCE
1955; 1830
1990-96
1986 (replica); 1501-1600 (original)
1801-1892 (prepared); 1946 (element replaced)
1830 (original); 1967 (model)
4000-2001 BCE
1903 (original); 1982 (model)
2686-2613 BCE
circa 1934