
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1781-1790
1777-1785
1791
1795
1775
1775
1794
1798
1797
1805
1800
1780
1783-1800
1795
circa 1808
1785-1795
1770-1800
1785
1776-1780
1776-1780
1776-1780
1808
1793-1803
circa 1805
1807
1782-1793
1770
1785-1790
1784
1784
1795-1810
1863-7
1791
1808
1786
1800
1776
1807
1787
1770-1780
1790
1796
1794
1800
1800
1800
1795-1805
1807
1792