
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1846
1791
1830 (original); 1967 (model)
1780-1850
1815-1825
1801-1838
1771-1830
1795-1805
1829
1744-1774
1821
circa 1842
1801-1830
1849
1780
1847-1848
1775
1822
1829
1801
1801-1830
1793-1803
1849
1837
1794
1821-1831
1955; 1830
1842
1830-1850
1846
1842
1847
1832
1845
circa 1805
circa 1750
1745-1755
1752
1762
1750-1795
1798
1755
1735-1752
1762
1762
1756-1800
1745-1755
1745-1755