Stater pheneos

Come si fa a capire se una moneta molto simile a questa è autentica?

Hello  and welcome aboard

First good picture of  obverse and reverse

If possible a picture of the edge

And weight and diameter

Queste sono le foto… il peso te lo giro stasera

Il diametro è 25mm

 Now three pictures of the same side - what is on the other side? 

Come ti sembra? Serve altro?

 I do not need anything else, thanks. 

Just asking for anyone wanting to identify. 

This coin was sold in 2012 for 300k $ and right now again in sale for same money, the chance that your coin is authentic is small, but it worth to show it to some experts