Copper-alloy, 2.26 grams, 37.28 mm. Circa 12th-14th century AD. A pin key of Type IV cast in copper-alloy. The bit is a simple rectangle, the bow is circular with a lobed upper extension and the shaft has a collar at the upper end. The key is very dainty and presumably opened a very small and discreet lock. Reference: London Museum Medieval Catalogue 1930, reprinted Ipswich, 1993 p.136 and plate xxix (1). Very fine condition. Provenance: found Lancashire, England 2007.