
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1791
1775
1830 (original); 1967 (model)
1846
1780-1850
1815-1825
1771-1830
1801-1838
1795-1805
1744-1774
1829
1822
1849
1780
1801-1830
1847-1848
1821
1775
circa 1842
1829
1801
1801-1830
1837
1794
1842
1842
1832
1845
circa 1750
1752
1762
1750-1795
1798
1755
1745-1755
1745-1755
1842
1797
1805
1800
1780
1783-1800
1830
1795
circa 1808
1840
1785-1795
1770-1800
1771-1800