Hi Declan,
I have seven or eight in various grades and none of them have surfaces which look like this one. I'm no hammered expert but my instincts are to think its shouting 'I'm a fake, and I don't give a damn who knows it!'. The colour is very reminiscent of the WRL replicas which often appear on ebay. Those usually have 'WRL' stamped onto them somewhere so I'm concerned about that (conveniently?) rubbed area at 5 o'clock on the reverse. I also think your asking in the first place suggests your own instincts are telling you this one isn't right.
As I say, these are just my initial feelings, I'm sure one of the resident hammered coins experts will be able to confirm one way or the other very soon.