Anyone seen this before?

I bought this at an estate sale recently but I can't find out any information on its origin. It's obviously a mask. (There are holes on vinyl flaps at either side of the lenticular image where an elastic may have once been.) Probably a child's mask. (It's very small. Approx. 4.5" x 3.75"). Other than that though, I don't have any information about it. (There are no identifying markings printed anywhere). Any ideas? How old do you think it might be?