
Rubber vault cap
1938-1940
1938-1940
1839 (original); circa 1988 (replica)
1830 (original); 1967 (model)
1903 (original); 1982 (model)
1940
circa 1938
1938
1938
1938
1938
1938
1940
1955; 1830
1939
1938 and 1951
2000-100 BCE
1938
1940
1938
1938
1939
1801-1892 (prepared); 1946 (element replaced)
1938
1940
1938
1940
circa 1940
1938
1938
1938
1940
1940
1938-1939
4000-2001 BCE
circa 1939
1938
1952-3
1956-09
1938
1956-09
1938
1940
1940
1990-95
1939
2050-1750 BCE
1940
1938-09-28
circa 1940
1879 (1956)