Severina, wife of Aurelian, AE antoninianus 
(4.36g), Antioch. 274 AD, 

SEVERINA AVG, diademed and draped bust right, on crescent
CONCORDIAE MILITVM, Concordia standing facing head left, holding 
two standards, no officina letter.
XXI in exergue. 

RIC does not list the mark Q on the right side, only the left. 

RIC V-I 20 var (no officina letter)

Contributed by Nureldeen of the Forum Ancient Coins, Jan. 2011