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
1681
1675-1679
1738-1777
1775-1785
1776
1760-1775
1701-1752
circa 1800
1775-1799 (original); 1900-1907 (model)
1728
1735-1745
1797
1785
1717-1725
1603
1720
1625
1607-1653
1607-1618
1700-1710
1763
Made late 1700s, modified 1800s
1673
1654
1701-1723
1668-1672 Probable
1772 (original); 1919 (model)
1701-1800
1701-1800
1705-1737
1601-1750
1785
1783-1800
1726-1728
1700
1761-1762
1672
1675-1700
1784
c.1750
1599