Well, for one, I doubt it was made in China even though the back side is "Ban Liang". Ban Liang were made of bronze and stylistically this one bears zero resemblance. So I think we can rule that out.
I think the characters on the other side is very telling, it is not Chinese, or any the sino influenced nations korea, , japan, Ryukyu. So my best guess is that it is from one of the southen east nations, Java? Bali? Natives made a ton of Chinese coin immitations (badly), so this might be it.
Sorry if I can't offer more insight to it.