As the item has met more than one of the Arts Council reviewing committee’s Waverley criteria, the board will advise the government whether it identifies as a national treasure.
Committee member Tim Pestell said: “I hope that the bar placed on its export allows a museum to acquire this wonderful artefact as it has much yet to tell us about this pivotal period in English history.”
Arts Minister Sir Chris Bryant added: “This beautiful panel potentially holds information into how the mediaeval kingdoms of this country interacted and co-existed.
“I hope a UK buyer can be found so it can be studied further and its stories can be shared with the public.”
The export bar will last until 23 March 2025 and period owners will have 15 working days to consider any offers.
A second deferral period will begin after an option agreement is signed and will last for three months.
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