Hmmmm...something's amiss here...
And it's a gigantic...CHIN? This classic era plush Sonic doll has something that's gone wrong...but for the first time it seems to be that it's his lower face? (Usually plush will make mistakes elsewhere) The construction for the rest of the plush is pretty decent, with good hands for the time, appropriately big/long feet, and nice construction for the spikes. He suffers a bit from 'big body', but it's not terrible. They do include the buckles for the shoes. The upper-head/nose and eyes are all pretty well constructed (especially for the times).
So what happened? Why is the chin enormous?
There was probably a mis-labeled number somewhere on his pattern, like a 68 was put as an 86 or some other error that caused the lower face size to nearly double what it should be. (especially visible on the side view) It doesn't make him terrible looking, but it also doesn't really look like Sonic, but a similar character instead. The tag seems to be similar to an early / same-era Japanse paper tag.