
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1780-1850
1801-1830
1839 (original); circa 1988 (replica)
1783-1800
1799-1802
1777-1785
1831
1831
1846
circa 1842
1849
1760-1775
1847-1848
1829
1775
1801
1066; 1876
circa 1832
1788
1832
1845
1762
1798
1842
1797
1893-4
1934
1805
1800
1780
1812
1830
1795
circa 1808
1840
1785-1795
1771-1800
1821-1850
1771-1830
1835
1783
1837
1848
1850
1840
1826
1845
1776-1780
1815-1825