It's pretty far gone, but it may be a Severus Alexander from Rhesaena, Mesopotamia. Sorta like the second one down from the top here (Tyche seated left, above swimming river god, for the reverse):
http://www.forumancientcoins.com/me...pot_pt02.htm
http://www.forumancientcoins.com/me...pot_pt02.htm





















