According to the Jerusalem Post, pointed out by Joseph Lauer and a reader
on Jim West's blog, Eilat Mazar found another seal during excavations:

http://www.jpost.com/servlet/Satellite?cid=1200475897717&pagename=JPost%2FJPArti\
cle%2FShowFull

The seal reads "tmx" (TamaH) and Mazar dates it to 538-445 BCE. It includes
an image of two priests sacrificing to the moon god Sin. A photo of
the seal is
included in the above link.

Yitzhak Sapir