"Isaiah’s Signature Uncovered in Jerusalem: Evidence of the prophet Isaiah?" By Megan Sauter. Bible History Daily. Biblical Archeology Society. 22 Feb 2018. Quote by Mazar: "Because the bulla has been slightly damaged at end of the word nvy, it is not known if it originally ended with the Hebrew letter aleph, which would have resulted in the Hebrew word for "prophet" and would have definitively identified the seal as the signature of the prophet Isaiah. The absence of this final letter, however, requires that we leave open the possibility that it could just be the name Navi. The name of Isaiah, however, is clear."
In find of biblical proportions, seal of Prophet Isaiah said found in Jerusalem. By Amanda Borschel-Dan. The Times of Israel. 22 February 2018. Quote: "Chanced upon near a seal identified with King Hezekiah, a tiny clay piece may be the first-ever proof of the prophet, though a missing letter leaves room for doubt."