
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1783-1800
1777-1785
1760-1775
1775
1066; 1876
1788
1762
1798
1797
1800
1780
1795
1785-1795
1771-1800
1783
1776-1780
1776-1780
1776-1780
1794
1782-1793
1762
1762
1761
1762
1762
1762
1762
1781-1790
1775-1785
1770-1800
1785
1785
1770
1785-1790
1784
1784
1769
1757
1762
1761
1762
1762
1791
1786
1800
1776
1787
1790
1796