
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1690
1775
1681
1744-1774
1780
1775
circa 1750
1745-1755
1752
1762
1701-1752
1755
1720
1701-1752
1700-1752
1708
1735-1752
1729-1753
1762
1762
1745-1755
1745-1755
1735-1754.
1696-1700
1752
1762
1761
1762
1762
1762
1770-1780
1780
1680
1760
1700-1725
1685
1690
1740-1749
1700-1725
2000-100 BCE
1725-1755
1701-1730
1778
1701-1750
1776-1780
1776-1780
1776-1780
1725-1775
c.1750