
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1781-1790
1777-1785
1815-1825
1791
1795
1775
1821
1775
1793-1803
1794
circa 1805
1807
1782-1793
1770
1785-1790
1784
1815
1798
1784
1815
1797
1795-1810
1893-4
1863-7
1791
1808
1786
1800
1776
1807
1787
1770-1780
1821
1805
1790
1796
1800
1800
1794
1800
1780
1783-1800
1770-1800
1812
1800
1805-1815
1795-1805
1807
1812