
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1775
1770
1776
2000-100 BCE
1778
1776
1705-1737
1770-1775
1772
1775
1775
1771
4000-2001 BCE
1642-1649 (original); 1883 (model)
1936
1990-95
1610; 1923
1668; 1924
1960-1979
1775
1775
1778
1777
1778
1772
1777
1777
1773
1772
1776
1779
1774
1774
1777
1770
1776-1777
1778
1773
1779
1773
1776
1774
1775
1777
1777
1777
1774
1773