
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1775
1791
1795-1805
1744-1774
1780
1775
1801
1794
circa 1750
1752
1762
1750-1795
1798
1755
1735-1752
1745-1755
1745-1755
1735-1754.
1797
1805
1800
1780
1783-1800
1795
circa 1808
1785-1795
1770-1800
1771-1800
1750-1800
1785
1776-1780
1776-1780
1776-1780
1750
2000-100 BCE
1813
1778
1808
1810-1817
c.1750
1750
1780-1820
1793-1803
circa 1805
1745-1755
1782-1793
1735-1753
1762
1762