
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1780
1775
1780
2000-100 BCE
1778
1776-1780
1776-1780
1776-1780
1770
1769
1776
1767
1770-1780
1776-1780
1776-1780
1778-1780
1766
4000-2001 BCE
1776
1705-1737
1770-1775
1772
1775
1775
1771
1780
1642-1649 (original); 1883 (model)
1936
1990-95
1610; 1923
1766
1770-1780
1960-1979
1668; 1924
1767
1775
1774
1775
1775
1767
1775
1774
1768-1774
1775
1778
1771
1777
1775