Original Ancient Coin Or A Fake?

It looks a bit chewed up and it is difficult to see the fabric of the coin from the photos. It is Antoninus Pius possibly Pax reverse. Have a look on wildwinds. Do you know the weight?

It is almost certainly a genuine copper "As" of Antoninus Pius. As stated the coin has been harshly cleaned and has some corrosion issues. Best thing to do would be leave it in olive oil for a few months to darken it.
Not too much value to the coin. It might fetch $20 but probably less. Antoninus Pius was the supreme 'Mr Nice Guy' and collectors tend to value skunks like Nero or Caligula much more. He ruled the Empire for 20 years and his coins are quite common. I tend to think it is an ANNONA reverse (Pax generally has a Palm branch raised) but it is certainly a common variety. Rare types of AP with a Brittania reverse would bring closer to $100 even in this condition.

Did you find it yourself ?
If so then of course the coin is priceless !