@KN, I can see a parting line pretty clearly on that last photo that you have posted. I'm pretty sure that it should be struck so that one should be a fake also. I can't tell well enough to offer an opinion on the remaining, but trust @echizento's opinion.
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
The Athena/owl coin is a copper "tourist copy" replica of a silver tetradrachm.
The two smaller Black Sea coins are very commonly faked by the fake-makers in Bulgaria; their skill is higher than most. I personally don't buy Black Sea coins unless it's from a dealer with a good reputation.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis