
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
1837
1794
1821-1831
1955; 1830
1832
circa 1805
circa 1750
1752
1762
1750-1795
1798
1755
1762
1762
1756-1800
1752
1797
1762
1761
1762
1762
1762
1893-4
1934
1837
1770-1780
1805
1800
1780
1783-1800
1770-1800
1812
1760