
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1791
1830 (original); 1967 (model)
1815-1825
1771-1830
1795-1805
1829
1744-1774
1821
1801-1830
1780
1775
1822
1829
1801
1801-1830
1793-1803
1794
1955; 1830
circa 1805
circa 1750
1745-1755
1752
1762
1750-1795
1798
1755
1720
1735-1752
1729-1753
1762
1762
1756-1800
1745-1755
1745-1755
1735-1754.
1752
1797
1762
1761
1762
1762
1762
1893-4
1770-1780
1805
1800
1780
1783-1800