
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1791
1775
1830 (original); 1967 (model)
1815-1825
1771-1830
1795-1805
1801-1830
1829
1822
1780
1821
1775
1829
1801
1801-1830
1837
1794
1832
1762
1798
1797
1805
1800
1780
1783-1800
1830
1795
circa 1808
1785-1795
1770-1800
1771-1800
1771-1830
1835
1785
1837
1776-1780
1776-1780
1776-1780
1771-1830
1771-1830
1834
1834
1834
1837
2000-100 BCE
1813
1778
1826
1801-1830