This is number three from a group of four Roman coins that came in from Mike Ruczynski. The coin is a denarius of Caracalla and was struck during the period when he was Augustus (AD 198-209) with his father Septimius Severus.
On the obverse the legend reads ANTONINVS PIVS AVG around the laureate and draped bust of Caracalla. On the reverse Roma holds a spear and the tiny figure of Victory and if the full legend was visible it would read PONT TR P VI COS. In volume II of Roman Coins and Their Values denarii of this type are listed as number 6856. The type was struck at Rome in 203 AD.
Some areas of the coin are quite good but there are some chips and deposits on the edge, which detract from the overall appearance of this denarius. And, from the look of the edge it could be plated rather than solid silver. Therefore, the coin itself would need to be examined before I could say what it might be worth.