Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1690
1610; 1923
1712-1713
1769
1681
1701-1752
1728
1735-1745
1717-1725
1720
1700-1710
1990-96
1763
Made late 1700s, modified 1800s
1701-1723
1690-1710
1705-1737
1700
1726-1728
1680
1761-1762
c.1750
1730-1750
1695-1702
1752
1750
1685-1695
1700-1710
1708
1755
1685-1695
1701-1752
1720
2000-100 BCE
1745-1755
1715-1725
4000-2001 BCE
1720-1770
1762
1750-1770
1755
1685
1715-1725
1724
1769
1680-1690
1750-1766
1695-1696
1700-1752