
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1915-1917
1841
1894-1904
1900-1910
1844
1837
1790
1801-1900
1950-1951
1951
1925-1930
1856
1630
1901-2000
1724
1890-1900
2005
1666-1680
1944
2019
1870-1910
1883-1900
c.1825
1501-1600
1677
1862-1863
1770-1830
1750-1837
1750-1900
1801-1900
1856-1900
1870-1910
1801-1900
1915-1925
1870-1910
1870-1910
1870-1910
1870-1910
1958-1965
1820-1910
1880-1910
1861-1930
1957
1914-1918
1915-1920
1901