This was a recent artifact found in Jerusalem (Found by Efrat Greenwald, member of the Ophel Expedition). King Hezekiah lived between 739 BC - 687 BC (Between ages 51-54 years old when death occured). If you want to learn more about this king, read the "Gods and Kings" Book Series, by Lynn Austin!
To be honest, I could just sit down and talk all about King Hezekiah with you all for hours upon hours! I'm a Christian, and I love this King because he was such a huge inspiration to many, and brought Yahweh back to the people of Israel, and erased their idolatry that has been caused by previous kings (Such as King Uzziah, King Japheth, and King Ahaz; Those names are in order of ancestry, King Uzziah is father of King Japheth, and King Japheth is father of King Ahaz)!!