
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1846
1791
1830 (original); 1967 (model)
1780-1850
1801-1838
1815-1825
1771-1830
1795-1805
1744-1774
1845-1855
1822
1829
1849
1780
1801-1830
1847-1848
1821
1775
circa 1842
1829
1801
1801-1830
1854
1837
1794
1842
1842
1845-1855
1832
1845
circa 1750
1752
1762
1750-1795
1798
1755
1735-1752
1745-1755
1745-1755
1735-1754.
1842
1797
1805
1800
1780
1783-1800
1830
1795