George III's pendulum
1762
1762
1783
1785
1785
1778
1762
1769
1755
1761
1761
1776
1757
1784
1762
1784
1762
1762
1762
1752
1752
1762
1752
1762
1755
1750
1782
1787
1764
hallmarked 1788
1762
1762
1770
1755
circa 1750
1750-1766
1785-1789
1750-1770
1776-1780
1778
1785
1776-1780
2000-100 BCE
1777-1785
1775-1785
1776-1780
1750-1760
1758-1773
1758-1769
1758-1769
1760-1770