From Jim Davila:
THE HEBREW UNIVERSITY OF JERUSALEM: Impression of King Hezekiah’s Royal Seal Discovered in Ophel Excavations South of Temple Mount in Jerusalem.
“First seal impression of an Israelite or Judean king ever exposed in situ in a scientific archaeological excavation
Discovery brings to life the Biblical narratives about King Hezekiah and the activity conducted during his lifetime in Jerusalem’s 1st Temple Period Royal Quarter”
This is an exciting discovery, chiefly because, as it says above, this is the first seal impression mentioning Hezekiah which has been uncovered in a scientific excavation. Other Hezekiah bullae (clay seal impressions) have surfaced on the antiquities market since the 1990s, but one could always doubt their authenticity. There is no doubt that this one is authentic. It is very sad that the papyrus document it once sealed has long ago disintegrated into dust.
For more details and comment, see PaleoJudaica.