
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1705-1737
1769
1990-96
1762
1770
1762
1762
1769
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1767
2000-100 BCE
1764
1772 (original); 1919 (model)
1765
1761
1761
1761
1762
1762
1762
1763
1761
1761
1761
1761
1772
1766
1771
1761-1762
4000-2001 BCE
1771
1770
1936
1610; 1923
1668; 1924
2050-1750 BCE
1990-95
1767
1730-1760 (original); 1931-1939 (replica)
1580-1588; 1930