
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1705-1737
1791
1775-1785
1775
1775
1801
1751-1800
1794
circa 1750
1762
1750-1795
1798
1755
1735-1752
1745-1755
1745-1755
1797
1805
1800
1780
1783-1800
1795
1785-1795
1770-1800
1785
1776-1780
1776-1780
1776-1780
1795-1805
1751-1800
c.1750
1788
1793-1803
circa 1805
1755
1745-1755
1752
1750
1782-1793
1752
1770
1738-1777
1785-1790
1784
1750-1760
1784
1755
1735-1753
1762