Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1610; 1923
1769
1990-96
1705-1737
2000-100 BCE
4000-2001 BCE
1769
1770
1765
1770
1766
1860-1920
1766
1766
1766
1768-1769
1767
1668; 1924
1642-1649 (original); 1883 (model)
1990-95
1936
300 BCE; 1905-1915
1765
1600-1500 BCE (original); 1900-1914 (copy)
1960-1979
1767
2050-1750 BCE
1580-1588; 1930
1768-1769
100-1 BCE; 1501-1600; 1914
1730-1760 (original); 1931-1939 (replica)
1910-1921
8500-2000 BCE
2000-1001 BCE
1991-1783 BCE
1766
700 BCE; 1931
circa 3000 BCE
1770
1894 (apparatus); 1742 (date of experiment)
1066; 1876
10000-5001 BCE
2000-100 BCE
1920-1923; 1963
1769
8500-2000 BCE
1766
1766
1501-1600; 1972