My thoughts too
I found this disc with in 2 or 3 inches from the Euro with my Garrett GTI 2500. The Euro seem to be made of a very thin layer of a non-ferrous metal which looked pressed on from each side with some sort of ferrous metal on the inside. This disc looks to have been dipped or coated by electrolysis. i think the disc was coated with silver
Yes that looks like an authentic Euro coin. I spend 2 months in Holland last year, ive still got some of them here at home.
But as stated, it looks like something from Greece's current economic situation!