Ok thx. Then must be this Caracalla Denarius. 212 AD. ANTONINVS PIVS AVG BRIT, laureate head right / PM TR P XV COS III PP, Salus seated left, feeding snake from patera & holding cornucopiae Only I dont see snake in my coin.
although that area of the reverse could be worn where the snake is supposed to be, I do see your point. If it was all worn you would see an impression of a long figure above the basket. I see none. Yeah that doesn't make sense
If there's no snake, it's likely to be Annona holding corn ears over a modius - RIC 195. There are some examples here, on the very useful OCRE site (the description on the page refers to Annona "standing", this is a typo', the book says sitting, as she is on the examples): http://numismatics.org/ocre/id/ric.4.crl.195 ATB, Aidan.
