
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1801-1830
1690
1712-1713
1783-1800
1738-1777
1799-1802
1701-1800
1777-1785
1701-1800
1744-1774
1700
1760-1775
1701-1800
1829
1775
1801
1751-1800
1066; 1876
1788
circa 1750
1762
1750
1701-1752
1750-1795
1798
1755
1701-1752
1700-1752
1735-1752
1745-1755
1745-1755
1797
1893-4
1805
1800
1780
1812
1830
1700-1725
1690
1795
circa 1808
1700-1725
1785-1795
1725-1755
1771-1800
1750-1800
1771-1830
1783