Here are some old PVC Sonic figures from the UK. It is likely some of these were from a box set. The tails is especially old, and not particularly on-model. It should be noted that the face/chest fur which should be white has discolored with time, which is usual for this figure. With "Talking Sonic's" box in the background, you can get an idea of the sizes.

What's that to the far right? It's a badly broken Eggman from one of the sets. The Shadow of course, is much newer than anything else in the photo.