
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1781-1790
1777-1785
1791
1795
1775
1775
1794
1782-1793
1770
1785-1790
1784
1784
1769
1791
1786
1776
1787
1770-1780
1790
1794
1767
1792
1795
1790
1795
1795
1790
1792
1792
1790
1785-1795
1775-1785
1780
1795
1785-1795
2000-100 BCE
1778
1783
1785
1785
1776-1780
1776-1780
1776-1780
1788
1780
1776
1775-1795
1705-1737
1775-1794