Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1690
1610; 1923
1712-1713
1769
1681
1744-1774
1675-1679
1701-1752
1728
1735-1745
1717-1725
1720
1700-1710
1763
1990-96
Made late 1700s, modified 1800s
1673
1701-1723
1668-1672 Probable
1772 (original); 1919 (model)
1705-1737
1690-1710
1680
1726-1728
1700
1761-1762
1672
1675-1700
c.1750
1730-1750
1750-1774
1695-1702
1675-1685
1752
1750
1685-1695
1700-1710
1708
1755
1685-1695
1720
1701-1752
2000-100 BCE
1745-1755
1715-1725
1675-1685
4000-2001 BCE
1667
1750-1770