
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1760-1775
1775
1775
1762
1770
1762
1762
1769
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1760
1765-1775
2000-100 BCE
1766
1765
1761
1705-1737
1761
1761
1762
1762
1762
1763
1761
1761
1761
1761
1770-1775
1772
1775
1775
1771
1761-1762
4000-2001 BCE
1760
1668; 1924
1990-95
1610; 1923
1642-1649 (original); 1883 (model)
1936
circa 3000 BCE