
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1769 - 1849
1764
1762
1770
1755
1755
1762
1762
1769
1757
1758-1769
1758-1769
1760-1770
1758-1769
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1760
1755
1767
2000-100 BCE
1755
1770
1990-96
1758-1769
1758-1769
1755
4000-2001 BCE
1755-1765
1769
1765
1761
1705-1737
1760
1761
1761
1762
1762
1762
1763
1761
1761