Well, I've gone and stumped myself. I have no clue what this coin is. Its about 29mm x 24 mm. Appears to read LIBERTAS 164[0?] on one side, some permutation of HENRE... on the other. If I had to guess, I'd say its from the Lowlands. Any clue?
That is incredibly unusual, but I would be going towards fantasy, not genuine currency. The lettering is wrong for the period.
I agree the lettering is unusual. Thats what made me think it was an unofficial issue or something. I think that, if it were a fantasy piece, it would be easier to figure out what it is. Lol.