What are the Hezekiah and Isaiah Bullae?

In archaeology, a bulla (plural bullae)
is a clay seal used when documents or goods were transferred from one person to
another. The sender would put a small piece of wet clay over where the item
would be opened, then press in a signet to seal the item and ensure it's
authenticity. An unbroken seal would let the recipient know the item wasn't
tampered with. A more modern equivalent would be a wax seal on a formal letter
or invitation.

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