Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
hallmarked 1788
1795-1810
1792
circa 1830
1972
1795
1850-1880
1965-1984
1925-1935
1800-1834
1925
1950-1976
hallmarked 1833; 1820-1833
1850-1872
circa 1800
1912
1810
hallmarked 1825
1790
1998
1938
1900-1910
1810-1900
1976
1810-1880
1925
1900-1922
1790-1808
1800-1820
1780-1790
1750-1810
1796-1816
1824
1795