hi @Webcazadora,
With Roman bronze, please specify size and weight.
"possibly Roma or Brittania on the back?"
The reverse is Roma seated, with Victory on hand. It symbolizes the military supremacy ("Victory") of the city of Rome.
I read (ANTO)NINVS AVG PI - VS PP which is a common title of (indeed) the emperor Antoninus Pius, reign 135-160..
"I took the following coin to my local Numismatist and they could not identify it."
That does not surprise me. I don't think your coin can be identified exactly. There's supposed to be a reverse inscription on this coin, identifying the year of coinage (e.g. TRP XXI), like this one..(second coin in that list)
https://www.cointalk.com/threads/lets-see-some-pius.235155/
Nice coin, though ! You found it ? Congrats when so..