
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1780
1776-1780
1776-1780
1776-1780
2000-100 BCE
1778
1778
1764
1776
1760-1770
1762
1770
1762
1762
1769
1761
1762
1762
1761
1762
1762
1762
1762
1762
1776
1770-1780
1767
1760
1765-1775
1776-1780
1776-1780
1766
4000-2001 BCE
1772-1773
1769
1770
1772 (original); 1919 (model)
circa 1780
1760-1775 probable date
1771
1990-96
1760-1772
1775
1760
1760-1775
1780
1776
1765