
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1781-1790
1777-1785
1760-1775
1791
1795
1775
1775
1794
circa 1805
1807
1782-1793
1785-1790
1784
1762
1762
1769
1765-1806
1761
1762
1795-1810
1762
1761
1762
1762
1762
1762
1791
1786
1800
1776
1807
1787
1790
1796
1794
1800
1800
1767
1800
1795-1805
1807
1792
1800
1790
1807
1802
1795
1795
1775-1800