Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1610; 1923
1769
1990-96
1772 (original); 1919 (model)
1763
1705-1737
1761-1762
1752
4000-2001 BCE
2000-100 BCE
1769
1771
1755-1765
1762
1762
1770
1755
1761
1762
1759
1752
1761
1771
1752
before 1753
1765
1761
1762
1752
1752
1755
1761
1762
1759
1752
1762
1760
1760
1752
1773
1762
1755
1760-1770
1772-1773
1761
1751
1762
1762
1752