
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1762
1770
1762
1762
1769
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1760
2000-100 BCE
1766
1765
1761
1705-1737
1761
1761
1762
1762
1762
1763
1761
1761
1761
1761
1772
1771
1761-1762
4000-2001 BCE
1760
1668; 1924
1990-95
1610; 1923
1642-1649 (original); 1883 (model)
1936
circa 3000 BCE
1760-1769
1772
1772
100 BCE-300 CE; 1890-1920
2000-1350
1772
1972-3