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
1799-1802
1794
1782
1787
1764
hallmarked 1788
1762
1762
1770
1780-1800
1802
1796-1797
1796-1798
1771-1800
1785-1789
1771-1800
1781-1790
circa 1800
1776-1780
1778
1785
1771-1800
1776-1780
2000-100 BCE
1777-1785
1775-1785
1770-1800
1776-1780
1797