Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1837
1801-1900
1724
1666-1680
1925-1930
1844
1944
1841
1915-1917
2005
1856
1890-1900
1630
1869
1900-1910
1901-2000
1951
1894-1904
2019
1790
1950-1951
2019
1862-1863
1870-1910
1920-1930
c.1825
1871-1885
1860-1870
1501-1600
1725-1730
1719-1733
1900-1908
1851-1920
1677
1885-1920
1770
1930-1950
1831-1920
1901
1801-1900
1501-1600; 1972
1894
1865-1870
1929
1900-1934
1801-1900
1845-1855