
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1738-1777
1838
1845-1855
1797-1804
1752
1729-1753
1745-1755
1745-1755
1701-1900
1701-1800
1925-1928
1822-1875
1762
1762
1879
1810-1817
1801-1838
1848-1852
1850-1897
1790
1830
1601-1700
1849
1630
1790
1880-1920
1780-1860
1861-1866
1801-1900
1701-1900
1701-1800
Before 1932
1601-1900
1701-1900
before 1928
1780-1850
1871-1900
1701-1900
1834-1883
1801-1900
1701-1900
undated
1790-1810
1600-1900
1775-1785
1801-1900