Caracalla, AE17 of Rhesaena, Mesopotamia. 4.12 gr. 218-222 AD. 

(..ANTWNINON CEB or similar), Laureate head right.
CI-II S-P (S retrograde) to left and right of vexillum.

cf Castelin 2.

With permission of truecoins on ebay, March 2013.