welcome to Numista!!
Where did you get it for what price?
Did you try some silvertests?
http://www.silvercoins.com/fake-silver-coins-14-ways-to-spot-counterfeits/
Is that the real color or is it the light?
Did you compare the weight and dimensions?
The details are too crude to make it a real coin
MO:ARG:ORD:FOE:BELG.GEL:&:C:Z
moneta argentea ordinum foederatarum belgii Gelriae et comitatus Zutphaniae