
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1948-1953
1878-1879
1910
1838
1802
1936
1837
1819-1905
1879
1850
1797-1804
circa 1897
1790-1819
1901-1930
1815
1758-1769
1758-1769
1760-1770
1758-1769
1829-1851
1761
1878
1858
1865-1866
1848-1852
1846
1844
1790
1830
1795-1805
1801-1900
1840
1802
1816
1875
1790-1810
1790-1819
1873
1790-1819
1790-1819
1758-1769
1913
circa 1900
1720-1730
1765
1690-1710
1752