Bob Cargill has an amazing video up detailing the discovery of a jar handle containing the impression of a seal dating back to the time of King Hezekiah. He took the video at the site. Specifically, this is an LMLK seal impression (more on that here).
What's fascinating about this is that the video records the supervising archaeologist identifying the piece for the first time just as it is being brought out of the ground. In the video you can see him actually blowing the dust off the find! Great stuff! Enjoy!