
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1762
2000-100 BCE
1770
1762
1762
1769
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1760
1766
4000-2001 BCE
1765
1761
1705-1737
1761
1761
1762
1762
1762
1763
1761
1761
1761
1761
1772
1771
1761-1762
1760
1642-1649 (original); 1883 (model)
1936
1990-95
1610; 1923
1766
1668; 1924
1960-1979
1767
1767
1769-1770
1767
1767
1772