
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1775
1780
1776-1780
1776-1780
1776-1780
1770
1769
1776
1770-1780
1767
2000-100 BCE
1778
1776-1780
1776-1780
1778-1780
1766
1780
1776
1705-1737
1770-1775
1772
1775
1775
1780
1771
4000-2001 BCE
1668; 1924
1990-95
1610; 1923
1642-1649 (original); 1883 (model)
1936
1770-1780
1776
1776-1780
circa 3000 BCE
1772
1772
1775
1782
1770-1779
100 BCE-300 CE; 1890-1920
2000-1350
1772
1780
1972-3
2000-1000
1772
circa 1800 BCE