Watt's end measuring machine
1776
1776
1794
1795-1805 (original)
circa 1805
1771-1800
1797-1804
1785
circa 1800
1776-1780
1776-1780
1776-1780
1793-1803
1778
1785
1785
2000-100 BCE
1782-1793
1795-1805
1784
1893-4
1799-1802
1770-1800
1778
1777-1785
1782
1787
hallmarked 1788
1770
1799
1802
1805
1796-1797
1796-1798
1775-1785
1785-1789
1771-1800
1783
1771-1800
1784
1785-1790
1798
1797
1781-1790
1780-1800
1790
1775-1795
circa 1780
1770
1775-1799 (original); 1900-1907 (model)
1797