
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1870
1775
1870
1846
1858
1791
1830 (original); 1967 (model)
1862
1865-1866
1780-1850
1815-1825
circa 1861
1858
1771-1830
1795-1805
1801-1838
1860
1869
1829
1845-1855
1821
circa 1842
1858
1853-1857
1801-1830
1849
1780
1847-1848
1775
1822
1829
1801
1801-1830
1853
1865
1793-1803
1849
1846-1859
1854
1837
1794
1852
1860
1821-1831
1955; 1830
1842
1830-1850
1846
1842