
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1781-1790
1777-1785
1791
1795
1775
1775
1794
1782-1793
1785-1790
1784
1762
1762
1769
1762
1762
1762
1762
1762
1762
1791
1786
1800
1776
1787
1790
1796
1794
1800
1800
1767
1800
1792
1800
1790
1795
1795
1775-1800
1790
1792
1790
1775-1785
1799
1762
1798
1797
1800
1780
1783-1800
1795