Caligula Denarius -- Real Or Replica

Hello all,

I found this coin with a few dimes, and my inner skeptic has refused to get excited.
I have determined this to be a Caligula denarius, and then I found that these are commonly reproduced. I am a complete neophyte.
I am attaching a scan of the front and back.

My suspicions are that:
1. seems suspicious that it is in relatively good shape
2. I found it in circulation
3. from other images I've seen online, the top circle at the top of the wreath on the back should be 'hollow' but this one is solid.


my hope is that it is in fact authentic and someone put it into circulation by mistake

is there otherwise a test I can do, which wouldn't cause damage, to verify its authenticity?




I think I already know my answer.
because it looks a lot less like this:
http://www.wildwinds.com/coins/ric/...RIC_0019.jpg

and more like this:
http://www.etsy.com/listing/7022424...f?ref=market

thoughts?