You know, this doesn't seem to best way to get a kid interested in astronomy. The thing looks like it was designed by a pharmaceutical company.
This wheel is 5.75 inches across and is in excellent shape. It bears no date, but the books the Schneider's wrote date back to the early 60s or thereabouts.
Well, who were Herman and Nina Schneider? Herman was a public school science teacher in NYC and Nina was, among other things, a Shakespearean scholar. They wrote a lot of children's books together such as:
Science for Today and Tomorrow
Let's Look Under the City
Science Fun With Milk Cartons
Science Fun With a Flashlight.
They also wrote Let's Find Out About Heat, Weather and Air. That title brings to mind the slogans from North Korean propaganda posters.
They sound well-intentioned. They just needed a better marketer.