Well my AP has arived from Germany today. She once again completes my "5 Good Emperors" set. It looks like Annona on the reverse. I think the ID is RIC-210 or Sear 1246.
The closest match that I can find is RIC 251. From Wildwinds: http://www.wildwinds.com/coins/ric/antoninus_pius/t.html Antoninus Pius Denarius. 155-156 AD. ANTONINVS AVG PIVS PP IMP II Laureate head right TR POT XIX COS IIII Fortuna standing right holding rudder on a globe & cornucopiae. I read somewhere that there are over 10,000 known different types of coins issued by Antoninus Pius during his long reign.