
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1712-1713
1783-1800
1738-1777
1701-1800
1777-1785
1701-1800
1744-1774
1760-1775
1701-1800
1775
1801
1751-1800
1066; 1876
1788
circa 1750
1762
1750
1701-1752
1750-1795
1798
1755
1701-1752
1735-1752
1745-1755
1745-1755
1797
1800
1780
1795
1785-1795
1725-1755
1771-1800
1750-1800
1783
1776-1780
1776-1780
1776-1780
1725-1775
1794
1782-1793
1720
1762
1762
1752
1761
1762
1762
1762
1762