
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1769
1668; 1924
1763
1769
1760-1770
1764
1762
1762
1762
1762
1762
1762
1761
1762
1762
1762
1767
1767
2000-100 BCE
1761
1760
1762
1770
1770
1990-96
1765
1760
1761
1762
1762
1761
1761
1761-1762
1761
1761
1762
1761
1761
4000-2001 BCE
1766
1705-1737
1610; 1923
1936
1990-95
1730-1760 (original); 1931-1939 (replica)
1642-1649 (original); 1883 (model)
1960-1979
6000-5000BCE
300 BCE; 1905-1915