Thanks for the info - I probably got it from my dad's friend who worked for the tel co. He also gave me old non-working phones and parts, with which I had hours of fun. It probably ended up in my box of fair stuff since it was from the same time frame.
I think I remember the exhibit at the fair, where one could try a picture phone, and also maybe an exhibit where one could talk over a beam of light (?) Memories getting a bit fuzzy.