Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1690
1610; 1923
1712-1713
1769
1681
1675-1679
1701-1752
1728
1717-1725
1735-1745
1730-1750
1720
1990-96
1700-1710
1701-1723
1763
1690-1710
Made late 1700s, modified 1800s
1673
1726-1728
1675-1700
1705-1737
c.1750
1680
1700
1761-1762
1672
1675-1685
1750
1685-1695
1700-1710
1708
1752
4000-2001 BCE
1701-1752
1745-1755
2000-100 BCE
1715-1725
1685-1695
1675-1685
1675-1700
1769
1720-1770
1715-1725
1680-1690
1755-1765
1724
1750-1766
1700-1752