Salonina Billon Antoninianus. Siscia or Milan mint. Sole Reign of Gallienus.

SALONINA AVG, diademed, draped bust right.
CONCOR AVG, Concordia seated left, holding patera and double cornucopiae. 

RIC V-1 71 Siscia var (no mintmark); Cunetio hoard 1812, 
Appleshaw hoard 134, Göbl 1455mm, (Milan)

AAH sale on ebay, Jan. 2002.