Copper-alloy, 4.74 grams, 41.28 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 rectangle with a triangular tooth or recess on the leading edge. The bow has been formed as a lozenge by further folding the edges. Reference: London Museum Medieval Catalogue 1930, reprinted Ipswich, 1993 p.136 and plate xxix. Very fine condition. Provenance: found Suffolk, England 2006.