Kelly was given these vintage toy blocks from a friend, who I think purchased them on eBay. They're a Tupperware creation from 1971 called Busy Blocks.
I have a faint memory of playing with these things as a child, but I don't think our family owned them. Each block opens to reveal a little green figurine — army-men style — that corresponds to the picture on the side of the box.
Who knows, maybe they contain Bisphenol A. But the kids had a great time playing with them.
And the best part about 1970s toys? No princesses anywhere on them.