
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1712-1713
1742
1740-1753
1735-1754.
circa 1750
1752
1762
1750
1755
1735-1752
1735-1753
1745-1755
1745-1755
1752
1720
1755
1708
1762
1762
1769
1757
1752
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1740-1760
1715-1725
1745
1715-1725
1702
1755
1739
1750-1760
1710
circa 1715
circa 1710
1767
1750
1730
c.1750
1758-1769
1758-1769