Another (although pre-Mithradatic War) issue from Athens/Attica with similar (like the A - E) but not quite identical reverse devices...perhaps a starting point for research:
http://www.forumancientcoins.com/ca...g=52032&fld=http://www.forumancientcoins.com/Coins2/
(I suspect the size on the coin at that link was supposed to read "18.4" mm)