
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1915-1917
1950-1951
1844
1837
1790
1841
1894-1904
1900-1910
1801-1900
2005
1951
1925-1930
1856
1630
1724
1666-1680
1901-2000
1944
1890-1900
1871-1885
1885-1920
1860-1870
1830-1914
1870-1910
2019
1862-1863
1870-1920
1880-1910
1770-1830
1750-1837
1750-1800
1750-1900
1801-1900
1856-1900
1915-1925
1856-01
1880-1920
1870-1880
1700-1751
1912-1913
2001
1988
1880-1900
1890-1910