
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1701-1800
1775
1791
1795-1805
1744-1774
1780
1775
1801
1793-1803
1794
circa 1805
circa 1750
1745-1755
1752
1762
1701-1752
1750-1795
1798
1755
1720
1701-1752
1700-1752
1708
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
1770-1800
1812
1760
1805-1815
1760-1790