
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1752
1762
1755
1758-1773
1758-1769
1758-1769
1760-1770
1758-1769
1755
2000-100 BCE
1752
1770
1755
1762
1762
1769
1757
1752
1761
1762
1762
1761
1762
1762
1762
1762
1762
1767
1760
1755
1767
1764
1770
1990-96
1771
1758-1769
before 1753
1752
1752
1752
1752
1752
1751
1752
1772 (original); 1919 (model)
1760-1772
1755-1765
1769
1765