Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1788
1690
1701-1800
1610; 1923
1712-1713
1775
1725-1780
1769
1738-1777
1775-1785
1776
1760-1775
1701-1752
circa 1800
1775-1799 (original); 1900-1907 (model)
1728
1735-1745
1797
1785
1717-1725
1720
1700-1710
1763
Made late 1700s, modified 1800s
1701-1723
1772 (original); 1919 (model)
1701-1800
1701-1800
1705-1737
1785
1783-1800
1726-1728
1700
1761-1762
1784
c.1750
1700-1800
1730-1750
1756-1800
1776-1780
1750-1774
1695-1702
1782-1793
1720-1800
1752
1750
1701-1800
1700-1710
1701-1800