Real or Fake?

[Coin#addict]

Hi guys

I have this Celtic looking coin which weighs 1.2 grams. I know absolutely nothing about them but I was told few years back it was a fake. It was purchased in a joblot of metal detecting finds, over 100 different coins that were all legitimate,this one was on the fringes of his photos and blurry, so he wasn't touting it for the auction. 

Just double checking, because if it is fake, someone has went to a lot of trouble surely to make just this one, as I cannot find another identical example online??

Thank you ☺️

[Peckris 2]

Here is a gold coin with a similar obverse:

https://www.baldwin.co.uk/product/atrebates-regini-eppillus-gold-quarter-stater/

I'm afraid my knowledge of these is almost zero.