George III's pendulum
1762
1762
1783
1785
1785
1778
1762
1769
1761
1761
1782-1793
1776
1784
1762
1784
1785-1790
1762
1798
1762
1762
1762
1762
1794
1782
1787
1764
hallmarked 1788
1762
1762
1770
1796-1797
1796-1798
1785-1789
1781-1790
1776-1780
1778
1785
1776-1780
2000-100 BCE
1777-1785
1775-1785
1776-1780
1797
1799
1760-1770
1799
1705-1737
1762
1761
1775-1794
1790