George III's pendulum
1762
1762
1783
1785
1785
1778
1762
1769
1755
1761
1750-1795
1761
1782-1793
1776
1757
1784
1762
1784
1785-1790
1762
1762
1762
1752
1752
1762
1752
1762
1755
1750
1794
1782
1787
1764
hallmarked 1788
1762
1762
1770
1755
circa 1750
1750-1766
1785-1789
1781-1790
1750-1770
1776-1780
1778
1785
1776-1780
2000-100 BCE
1777-1785
1775-1785
1776-1780