You know, the more I look at it I'm starting to think this looks like a poorly done cast replica. Just doesn't look like legit wear to me.
I agree that it does not look natural. Did you weigh it and sound test it?
Is there any reeding on the edge?
Weighing it would not be a very reliable method when it's been so worn. Sound test on the other hand is always the failsafe method of determining AG from anything else.