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Another thing you can look for on a Big Chap (other than it just being back in stores now), I THINK, is this black twist tie across the torso. They're using these flat black twist ties on the newer figures.
I may be wrong of course, someone correct me if I am, but I don't think the first release used the flat black twist tie. Other than that, it's a matter of looking for the clearer painted dome in the front.