
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1701-1800
1632-1640
1690
1775
1601-1850
1681
1501-1600
1846
1607-1653
1791
1830 (original); 1967 (model)
1630-1642
1780-1850
1815-1825
1801-1838
1771-1830
1795-1805
1700-1850
1829
1744-1774
1821
circa 1842
1554
1801-1830
1501-1800
1849
1675-1679
1780
1847-1848
1775
1822
1550-1800
1829
1501-1700
1801
1501-1700
1801-1830
1793-1803
1849
1837
1794
1821-1831
1955; 1830
1842
1830-1850
1846
1842
1847
1832