To be honest, I really don't know a whole lot myself.
This box was something my fiancee' lost in the process of a divorce. It belonged to her grandmother (northwestern PA) and she used to play with it as a child. She's in her mid-40's, so this would have been mid-70's, I assume. From the pictures her mother gave to me (seen in my original post), it appears to be about 4" x 4" x 4". She says she found another one, but it was in bad shape, so apparently it was not a one-of-a-kind item.
I know nothing more than that, unfortunately. I want to replace it "on the sly" because it meant so much to her.
Again, thank you for any direction or information anyone can share.