
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1701-1800
1690
1791
1681
1775
1830 (original); 1967 (model)
1846
1780-1850
1815-1825
1771-1830
1801-1838
1795-1805
1700-1850
1744-1774
1829
1822
1849
1675-1679
1780
1801-1830
1847-1848
1821
1775
circa 1842
1829
1801
1801-1830
1837
1794
1842
1842
1832
1845
circa 1750
1752
1762
1701-1752
1750-1795
1798
1755
1701-1752
1700-1752
1735-1752
1745-1755
1745-1755
1735-1754.
1842
1797
1805