
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1775-1785
1798
1775-1799 (original); 1900-1907 (model)
1788
1791
1780
1795
1785-1795
1785
1776-1780
1776-1780
1776-1780
2000-100 BCE
1778
1760-1790
1775-1799
1783
1785
1796-1798
1782
1796-1797
1785-1789
1787
1794
1785
hallmarked 1788
1778
1764
1776
1760-1770
1762
1782-1793
1770
1785-1790
1784
1784
1762
1762
1769
1761
1797
1762
1762
1761
1762
1762
1762
1762