
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1755
1769
1762
1763
1761
1668; 1924
1610; 1923
1750-1770
1758-1773
1758-1769
1758-1769
1760-1770
1758-1769
circa 1750
1762
1755
1762
1750
1764
1642-1649 (original); 1883 (model)
1752
1761
1761
1750
1762
1762
1752
1762
1762
1762
1750-1766
1755
1752
1770
1750-1760
1769
1757
1762
1762
1762
1767
1760
1755
1750-1760
1767
2000-100 BCE
1772 (original); 1919 (model)
1758-1769
1772-1773