Very interesting.
So from what I THINK I’ve seen, I’m led the believe that the “original” bootleg sculpt (lol) was produced by ThreeQ (their model MG 004). That said, there are several sellers who appear to be peddling the ThreeQ sculpt on eBay. Unfortunately, there is no active listing for this sculpt from the seller I used. Which brings us to the bizarre situation of wondering which bootlegger is the most trustworthy!
All that said, I’d probably say that if you go with a seller who is showing the ThreeQ logo that MIGHT give you the best chance of getting you a “first cast” bootleg, knock-off, unlicensed, rip-off head