A complete copper alloy rotary key, of Medieval dating (AD 1150 - AD 1400).
A number of very similar rotary keys are shown in G. Egan's 'Medieval Households' pages 111-119. From the size of the key and the presence of a solid shank it is likely that the key would have been used to lock a door rather than a casket or chest. Chest locks tend to have a hollow shank and are significantly smaller (ibid: 111). The keys illustrated in this volume are all dated from the late 12th - to late 14th centuries (AD 1150 - AD 1400). Therefore a similar date is suggested here for this example.
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