
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1744-1774
1760-1775
1775
1775
circa 1750
1762
1755
1735-1752
1745-1755
1745-1755
1755
1745-1755
1752
1750
1752
1770
1750-1760
1755
1729-1753
1735-1753
1762
1762
1769
1735-1754.
1757
1752
1761
1762
1762
1761
1762
1762
1762
1762
1762
1740-1760
1767
1745
1760
1755
1739
1740-1749
1750-1760
1765-1775
1745-1755
1730
1725-1755
2000-100 BCE
c.1750