Only one of these exist in the realm and it was originally given to King Aldric when it was first created and the ruling King of Aldenheim has been using it to seal all of their correspondents for over three hundred years.
with King Regent
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The matrix is a small iron stamp, palm-sized, engraved with the seal of the realm. When pressed into wax on a letter or document, it leaves an impression indistinguishable from an ordinary crown seal.