Yep, sorry, not authentic. Both coins are supposed to be silver, not brass.
The top one is supposed to be a silver
tetradrachm of Macedonian king Demetrius Poliorcetes, but they spelled his name wrong - DHMHIAIOY instead of DHMHTPIOY.
The design of the bottom one is a silver drachm or tetradrachm from the Macedonian League, probably the city of Amphipolis, similar to
this example.
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