Picked these up a toy vendor at a fair. I am told they are 47mm superballs. I don't believe they are made anymore. I'm impressed with the detail of the scenes. The one with the balloon shows a river, bridge, farm, roads, train, and possibly more. The scale (backgound compared to foreground balloon) works well. The same can be said about the sky diving scene.
click to enlarge photos
I saw these when I went on line trying to find out who makes the ones above. You can see more pictures on this person's flickr page: