There are some good threads here for learning about forged ancient coins. Maybe someone has the links to the beginner thread posted here last year?
https://www.cointalk.com/threads/ancient-coins-beginners’-faq-thread.324858/ Within that thread, post #29 has links to databases of ancient coin forgeries as well as links to places to learn how to detect forgeries.
#6 KINGDOM OF BACTRIA Eucratides I AR tetradrachm 16.28 g Hopefully some of these will be helpful to other newbies