
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1791
1775
1830 (original); 1967 (model)
1815-1825
1771-1830
1795-1805
1744-1774
1829
1822
1780
1801-1830
1821
1775
1829
1801
1801-1830
1794
circa 1750
1752
1762
1750-1795
1798
1755
1735-1752
1745-1755
1745-1755
1735-1754.
1797
1805
1800
1780
1783-1800
1830
1795
circa 1808
1785-1795
1770-1800
1771-1800
1750-1800
1771-1830
1785
1776-1780
1776-1780
1776-1780
1771-1830
1771-1830
1793-1803
1955; 1830
circa 1805