I found out who's the sculptor: ASAO GOTO. An asian/american SFX-Artist who did some works for movies. He did a great job on this bust!
It's funny how I got it. I asked an Ebay seller (he listed some old resin kits and magazines) if he has this bust... and he had it! He sad it's the paint master, so he doesn't really want to sell. But if the price is right, he will.
So I ended up paying pretty much for this one!