
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1791
1795-1805
1780
1775
1801
1793-1803
1794
circa 1805
circa 1750
1752
1762
1750-1795
1798
1755
1762
1762
1756-1800
1752
1797
1762
1761
1762
1762
1762
1893-4
1770-1780
1805
1800
1780
1783-1800
1770-1800
1760
1760-1790
1795
circa 1808
1775-1799
1792
1785-1795
1781-1790
2000-100 BCE
1770-1800
1771-1800
1750-1800
1778
1751-1800
1775-1785
1783
1785