Looks like a Ptolemy. I'll guess Ptolemy iii. Check out AC search and I'll bet you can prove me right...or wrong
here is a page of those types at this link on Vcoins:https://www.vcoins.com/en/Search.as...cords=100&SearchOnSale=False&Unassigned=False
As others have said and as you've already found, this is a bronze coin from the Ptolemaic dynasty. Exactly which Ptolemy isn't always easy to determine. The most up-to-date online resource for attempting a more accurate attribution is here. The amount of wear on your coin may make it difficult or impossible to pin to a specific type since the details which allow such specificity may not be discernible.
Even being a little heavy, it seems to be as you say from the countermarked type in Ptolemy IV - Series 5 - Kyrene Denomination Series. TIF's link given above is a very useful page and well worth saving for coins like this.
