Copper-alloy, 3.18 grams, 43.61 mm. Circa 11th-12th century AD. A barrel key of Type II made by rolling sheet copper-alloy over a former. The bit is a simple rectangle with recesses at the junction with the shaft. Reference: London Museum Medieval Catalogue 1930, reprinted Ipswich, 1993 p.136 and plate xxix. Very fine condition. Provenance: found Suffolk, England 2006.