An incomplete silver early medieval penny of the Vikings possibly minted in the name of Sihtric Caoch who ruled Dublin between 917-920 CE and was King of Northumbria from 921-927 CE. This coin is influenced by the Swordless St Peter type.
You can see the original at
This object is related to
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(c) Portable Antiquities Scheme, CC BY-SA 2.0
Portable Antiquities Scheme