Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1862
1775-1785
1785
1783-1800
1851
1840-1860
2010
1802
1999
1808
1796
1710
circa 1840
1740-1760
1792
1821
circa 1808
1804
1780
1745
1801-1819
1788
1790
1755
1989-2003
1800
1785-1795
1702
1784
1879
1807
1650
1801-1900
circa 1710
circa 1715
1790
1815
1630
1800
1800
1820
1801-1900
1785-1795
1700-1725
1908
1625
1730