
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1846
1858
1791
1830 (original); 1967 (model)
1775
1780-1850
1815-1825
1801-1838
1858
1771-1830
1860
1795-1805
1845-1855
1821
circa 1842
1858
1853-1857
1801-1830
1849
1780
1822
1829
1847-1848
1775
1829
1801
1801-1830
1853
1793-1803
1849
1846-1859
1854
1837
1794
1860
1821-1831
1842
1846
1842
1847
1845-1855
1832
1845
circa 1805
1752
1762
1798
1755
1762