I'm not a collector of this series, but I'd say this has ALL the hallmarks of a fake. Standard color, design sinking into the fields, blobby letters, uneven denticles. What does the inside of the hole look like? Can you tell if the metal is a different color inside? Oh, and is it attracted to a magnet?
I actually had to go and look up "candareen" a long time ago -- I saw it in a story, and my curiosity got the better of me. Since a mace is 10 candareens, the real coin represented 72 candareens -- a weird number if you're accustomed to decimal, but a natural one if you're using a duodecimal (12-based) system, similar to "50 cents". What I can't figure out is why they used decimal denominations (one mace = 10 candareens, one candareen = 10 cash) if they wanted to account by twelves.