
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1701-1800
1681
1791
1830 (original); 1967 (model)
1690
1775
1815-1825
1771-1830
1795-1805
1744-1774
1821
1801-1830
1780
1822
1829
1675-1679
1775
1829
1801
1801-1830
1793-1803
1794
circa 1805
circa 1750
1745-1755
1752
1762
1701-1752
1750-1795
1798
1755
1675-1700
1720
1701-1752
1700-1752
1708
1735-1752
1762
1762
1756-1800
1745-1755
1745-1755
1735-1754.
1752
1797
1762
1761
1762
1762