I can almost guarantee this is another Michael C Gross idol. When I first started collecting props I purchased what I believed to be an Idol that was given to Mr gross who was the executive producer on Ghostbusters by George Lucas. I was told it was bought in auction in the 90's with copies of the auction itself. It also contained a letter from Mr Gross explaing how he came to get possession of the idol. Since then I even contacted Mr gross personally to verify the story which he did. However over the years I have seen 2 more of these idols appear with similar letters. I believe this would be the third. I'm not sure who has the real one if any of us do but some of these if not all are probably reproductions.