
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1791
1830 (original); 1967 (model)
1775
1815-1825
1771-1830
1795-1805
1821
1801-1830
1780
1822
1829
1775
1829
1801
1801-1830
1793-1803
1794
circa 1805
circa 1750
1745-1755
1752
1762
1750-1795
1798
1755
1762
1762
1756-1800
1745-1755
1745-1755
1752
1797
1762
1761
1762
1762
1762
1893-4
1805
1800
1780
1783-1800
1770-1800
1812
1805-1815
1830
1760-1790
1795
circa 1808