Help Identifying This Coin (Can't Find Anything On It) (Id: Greek Fantasy Souvenir Coin)

Welcome to the community.
Looks like a modern reproduction/fantasy piece of some sort of ancient coin.

It's a modern piece and given the lack of any number representing a face value or date I would concur that it is modern taken/fantasy piece and not a coin.

It is a "fantasy coin", in the sense that it isn't a "real coin" and does not copy the design of a "real coin", but it does, technically, have a "denomination".

On the obverse, we have the goddess Athena. In quasi-classical-Greek around the outside, it says "Athena tetradrachmon 100 PCh.". "100 PCh" is kinda-Greek for "100 BC", so it claims to be replicating the obverse of an Athenian tetradrachm from around 100 BC. Needless to say, genuine ancient coins do not have "100 BC" on them as the date, and I wouldn't have picked that particular coin and era as the model for the obverse, since it's not a very close likeness. Genuine Athenian tetradrachms of 100 BC look like this: http://www.wildwinds.com/coins/gree...on_0871a.jpg

On the reverse, with the ship, it says "Kerkyraike Trieres 453 PCh." I would translate this as "Kerkyrean trireme, 453 BC". Kerkyra (also spelled the Roman way as "Corcyra") is the ancient Greek name for the island city-state of Corfu, on Greece's west coast. In 453 BC, the island owned a rather large fleet of warships, to protect their neutrality. I don't recall Kerkyra issuing coins depicting their triremes, though they did depict a ship prow on some of their later bronze coins.

In short: it's a fantasy souvenir coin, ancient-themed but not really ancient in design and not likely to confuse an expert in ancients. It's the sort of thing you could buy in modern Greece as a souvenir, without having to worry about Greek customs thinking it might be a genuine ancient coin and seizing it.