
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1752
1762
1755
1752
1755
1762
1762
1769
1757
1752
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1755
1767
1758-1773
1758-1769
1758-1769
1760-1770
1758-1769
1764
1755
1770
1760
2000-100 BCE
1758-1769
before 1753
1752
1752
1752
1752
1752
1752
1771
1770
1990-96
1751
1761
1761
1762
1762
1762