Ahhh, I think I remember where I got the faces... from a bin in the gift shop at the Science Museum of Minnesota on field trips.

I used to have a few of these rubber faces. I have no idea where I got them from though. I do remember having this face, and then another face which had a hat and a rounder face. I think I might have had a third as well. There are two holes behind the eyes, and another sort of by the chin below the mouth.