Though yours is different metal, it is the same as this on here from two years ago ...
https://en.numista.com/forum/topic9574.html
P.S. From there I saw suggested searching for Franchimont Foire and this page has both on there ...
http://www.delcampe.net/page/item/id,115213600,var,Theux--Franchimont--2-pieces-de-la-franche-foire-,language,E.html#.UyR8Ec4SDXQ
Translation:
It is a coin for fair Theux (Belgium):
http://www.foire-medievale.be/
Obv: in a circle, arms Marquisat Franchimont (silver three lions vert, armed and langued gules, crowned gold) + MONETA NOVA TECTIS (new currency Theux)
Rev: in a circle, cross and short FAIR FRANCHIMONT separated by reversed Z cruxiforme.
Source :
http://www.numismatique.com/forum/jetons-monnaies-necessite/identification-t43156.html
I guess it is like the coin I have
https://en.numista.com/forum/topic18079.html#p138531
where a modern event issues pretend aluminium coins from olden times.