
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1701-1800
1632-1640
1690
1607-1653
1791
1681
1501-1600
1775
1830 (original); 1967 (model)
1601-1850
1846
1780-1850
1815-1825
1771-1830
1630-1642
1801-1838
1795-1805
1700-1850
1744-1774
1554
1829
1822
1849
1675-1679
1780
1801-1830
1501-1800
1847-1848
1821
1775
circa 1842
1550-1800
1829
1501-1700
1801
1501-1700
1801-1830
1837
1794
1842
1842
1832
1845
circa 1750
1752
1762
1701-1752
1750-1795
1798