My Mom had this classic-looking toy on her kitchen table. I picked it up and put my thumb & pointer around the black cube in the middle, and gave it a spin.
A little later, I was joking with her & told her that I looked it up online. I said it was the original "fidget spinner" and was worth $500! She said "Really?!?!" & believed me for about 2 seconds, before I started laughing.
I couldn't find anything about it on Google, but it appears to be an old game where you spin the cubes to show random letters Then, maybe you try to make words out of it? It's not as fun of an explanation as being the first fidget spinner, but it was an still interesting old-school toy.