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George III's pendulum
1762
1762
1783
1785
1785
1785
1758-1773
1758-1769
1758-1769
1760-1770
1758-1769
1769
2000-100 BCE
1761
1761
1776
1784
1762
1784
1762
1798
1762
1762
1797
1762
1794
1770-1800
1771-1800
1777-1785
1778
1782
1787
1764
hallmarked 1788
1762
1762
1756-1800
1770
1799
1796-1797
1796-1798
1775-1785
1771-1800
1781-1790
1776-1780
1776-1780
1776-1780
1771-1800
circa 1800
1785-1789
1780-1800