Ancient Coin Added To My Collection

It looks like a Roman Provincial Coin from Petra, Arabia. The reverse looks like Tyche seated with TPA at upper left which would be part of the city name Petra. The obverse has a countermark, also called counter-stamp of the Greek letter delta which looks like a triangle. It's similar to one on Vcoins.com of Septimius Severus but yours may a different emperor. All of the obverse letters are worn off on your coin so I can't tell which emperor it is, may be Commodus or Elagabalus. On your example Tyche is leaning a little backward, the Septimius example Tyche is straight up. I found an example of Tyche leaning backward and it is of Commodus with a B countermark. Some Roman Provincial coins are scarce to rare and there may not be a coin online that matches your coin.

There is a book about ancient countermarks on Roman Provincial coins by author Howgego.

There is an online database called Roman Provincial Coinage that shows thousands of RPC coins from many different mints:
https://rpc.ashmus.ox.ac.uk/