Bought this at a recent small auction for €100. Someone else mentioned it's an "official museum replica" rather than genuine.
Since my expertise is mostly in Romans, I must admit I'm sort of out of my depth with this one. It's not ferromagnetic and the weight checks out at 3.76g, but I am concerned about some of the surface marks.
I hope someone with some more knowledge in these can weigh in and help verify (or not) the authenticity.
Afaik these were Electrum, and some of them look very light indeed. It should weigh something like 5g if it's and EL stater, which is of course well over what yours weighs.