Severus Alexander AR denarius.

Obv: IMP SEV ALEXAND AVG - Laureate head right. 
Rev: ANNONA AVG - Annona standing right with left foot on 
prow, holding a modius and rudder attached to globe. 
Rome mint 
RIC IVii, 190a
SEAR RCV II (2002), #7860

With kind permission of www.edgarlowen.com, Nov. 2011.