
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1829
1829
1815-1825
1781-1790
1777-1785
1831
1801-1830
1791
1795
1775
1830 (original); 1967 (model)
1821
1771-1830
1775
1837
1794
1837
1771-1830
1771-1830
1771-1830
1798
1797
1934
1805
1800
1780
1783-1800
1812
1830
1795
circa 1808
1840
1785-1795
1770-1800
1810-1840
1810-1840
1771-1830
1835
1785
1837
1840
1826
1776-1780
1776-1780
1776-1780
1808
1830-1840
1832
1793-1803