Copper-alloy, 3.97 grams, 43.21 mm. Circa 12th-14th century AD. A barrel key of Type III cast in copper-alloy. The bit is a simple rectangle with toothing fore and aft. The bow is circular and small for the proprtions of the shaft. Reference: London Museum Medieval Catalogue 1930, reprinted Ipswich, 1993 p.136 and plate xxix (1). Very fine condition. Provenance: found Suffolk, England 2006.