Watt's end measuring machine
1776
1776
1760-1770
1785
1776-1780
1776-1780
1776-1780
1769
1784
1762
1762
1782
1787
hallmarked 1788
1770
1775-1785
1785-1789
1762
1762
1761
1762
1762
1762
1762
1762
1781-1790
1778
1783
1785
1785
2000-100 BCE
1761
1782-1793
1784
1785-1790
1762
1778
1777-1785
1764
1790
circa 1780
1770
1990-96
1760-1772
1771
1775
1788
1776-1780
1776-1780
1705-1737
1760-1775