
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1837
1790
1950-1951
1915-1917
1844
1841
1894-1904
1900-1910
1801-1900
1951
1856
1724
2005
1925-1930
1666-1680
1630
1901-2000
1944
1890-1900
1752
1862
1829-1845
1880-1920
1801-1900
1750-1850
1801-1900
1700-1751
2020
1908
1927
1920-1950
1951
1871-1879
1811-1814
1929
1870-1900
1885-1920
1920-1950
1920-1950
1930-1950