
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1915-1925
1943
1847-1848
1838
1925-1935
1829
1934-1935
1920-1925
1665-1670
1870-1890
1801-1900
1835
1935
1903
1915-1918
circa 1910
1935
1880-1920
1901-1910
1850-1870
1850
1860
1945
1920-1950
1921-1930
circa 1900
1879-1923
1940
1776
1901-1930
1880-1940
1920-1940
1862
1889
circa 1897
1901
1917
1896
1755
1801-1838
1715-1725
1802
1837-1840
1870
1910-1926
1940
1685
1870
1855