Copper-alloy, 2.28 grams, 31.76 mm. Circa 11th century AD. A pin key of Type IV cast in copper-alloy. The bit is a rectangle and the locating pin is complete. The bow is a plain loop with a heart-shaped void. Keys of this type were already in use in 1066 (they appear to be shown on the Bayeux Tapestry) and continued in use throughout the medieval period. Reference: London Museum Medieval Catalogue 1930, reprinted Ipswich, 1993 p.136 and plate xxix (1). Very fine condition. Provenance: found Essex, England 2005.