
Rubber vault cap
1938-1940
1938-1940
1945
1942
1839 (original); circa 1988 (replica)
1943
1830 (original); 1967 (model)
1903 (original); 1982 (model)
1937
1937
circa 1942
1945
1940
circa 1938
1938
1938
1938
1938
1938
1940
1955; 1830
1944
1939
1938 and 1951
1944-1945
2000-100 BCE
1940-1944
1943
1937-1937
1942
1937-1938
1937-1938
1942
1938
1940
1938
1938
1939-1945
1939
1801-1892 (prepared); 1946 (element replaced)
1940-1945
1942-1945
1943-1945
1938
1940
1938
1940
circa 1940
1942-1945
1938
1937