
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1791
1830 (original); 1967 (model)
1815-1825
1771-1830
1795-1805
1829
1821
1801-1830
1780
1775
1822
1829
1801
1801-1830
1793-1803
1794
1955; 1830
circa 1805
1798
1797
1893-4
1770-1780
1805
1800
1780
1783-1800
1770-1800
1812
1805-1815
1830
1795
circa 1808
1814
1775-1799
1792
1785-1795
1781-1790
2000-100 BCE
1770-1800
1813
1771-1800
1778
1775-1785
1771-1830
1783
1785
1785
1826