Divus Carus AE Antoninianus. Siscia mint, under Carinus and/or Numerian, 
 283-285 AD. 

Obv: DIVO CARO PARTHICO, radiate head right 
Rev: CONSECRATIO AVG, large burning altar,  XXI in ex. 

RIC 110, Cohen 23.

[Imported from dirtyoldcoins.com, originally ancientauctionhouse eBay auction]