
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1769 - 1849
1764
1762
1770
1762
1762
1769
1758-1769
1758-1769
1760-1770
1758-1769
1761
1762
1762
1762
1762
1762
1762
1762
1767
1760
1767
2000-100 BCE
1758-1773
1761
1770
1772 (original); 1919 (model)
1990-96
1771
1760-1772
1758-1769
1758-1769
1772-1773
4000-2001 BCE
1769
1765
1761
1705-1737
1760
1761
1761
1762
1762
1762
1763
1761
1761
1761
1761