
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1701-1800
1681
1690
1791
1775
1830 (original); 1967 (model)
1815-1825
1771-1830
1801-1838
1795-1805
1744-1774
1801-1830
1829
1822
1780
1821
1775
1829
1801
1801-1830
1837
1794
1832
circa 1750
1752
1762
1701-1752
1750-1795
1798
1755
1701-1752
1700-1752
1735-1752
1745-1755
1745-1755
1735-1754.
1797
1805
1800
1780
1783-1800
1830
1700-1725
1685
1690
1795
circa 1808
1700-1725
1840