Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1862
1775-1785
1785
2013
1783-1800
1851
2010
1840-1860
1802
1999
circa 1840
1907
1796
1808
1710
1740-1760
1792
1989-2003
1788
1700-1725
1801-1819
1899
1821
1780
1745
1804
1784
circa 1808
1800
1785-1795
1795
1807
1755
1879
1800
1801-1900
1790
1702
circa 1710
1785-1795
1625
1908
1650
1815
1800
1630
1801-1900