Copper-alloy, 3.70 grams, 44.08 mm. Circa 12th-14th century AD. A barrel key of Type III cast in copper-alloy. The bit is a simple rectangle with toothing on the leading edge. The key has a thick shaft for its delicate circular bow which is attached to the bulbous shoulders. Reference: London Museum Medieval Catalogue 1930, reprinted Ipswich, 1993 p.136 and plate xxix (1). Very fine condition. Provenance: found Lancashire, England 2007.