Coin collecting has always been a Caveat Emptor proposition. 'Caveat Emptor' is Latin for 'Let the buyer beware' and it applies to each and every coin you might consider adding to your collection. Hence, we have CoinQuest and hundreds of other resources (books, magazines, professional authentication and grading services, and knowledgeable and honest collectors and coin dealers) that aid collectors in their quest for exciting, nice looking, authentic, rare, and valuable coins. There are many joys of collecting. Just be sure you avoid the pitfalls.
This specimen is none of (1) authentic, (2) rare, and (3) valuable. It is a modern replica of a non-existent Roman coin. Its value is zero.
Collecting ancient coins from Greece and Rome is a terrific hobby enjoyed by more and more numismatists (coin collectors) every day. It can also be financially rewarding at times. But, caveat emptor. There are plenty of shysters ready to take money from the unaware. Don't be one of them.
The picture and reference for this CoinQuest entry comes from Dr. Ilya Prokopov's Fake Ancient Coin Reports on ForvmAncientCoins.com. There is also another great collection of fakes on Flickr at this link.
CoinQuest thanks Forum Ancient Coins for use of their coin photo.