
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1712-1713
1690
1738-1777
1625
1744-1774
1760-1775
1640
1700
1681
1775
1066; 1876
circa 1750
1762
1750
1701-1752
1755
1701-1752
1700-1752
1735-1752
1745-1755
1745-1755
1625
1640
1640
1700-1725
1685
1690
1660
1700-1725
1625
1630
1725-1755
1725-1775
1668-1672 Probable
1630-1642
1720
1762
1762
1752
1761
1762
1762
1762
1762
1680
1740-1749
1663
1685-1695
1752