I received mine today (don't judge) and wanted to post some additional information. I don't know the original so can't tell you of anything obvious on the mold, but the sticker sheet is of mediocre quality and slight curling, so this would be the first obvious "tell". The instructions are high quality but that would be the first thing to bin if you wanted to fleece it as an original. Now here's the BAD part, and quite dangerous. There is a slight yellowing to the plastic (some minty white, so not uniform). So the presence of a slight yellowing on the front cockpit part (especially along the left and right side of it) could be used to "sell' it as an original --- you'd think, oh well it's yellowed from age, so can't be a knock off.
personally I am quite satisfied but this is NOT a product review. It's a warning - if you see yellowing on the cockpit but clearly WHITE on the remainder of the toy, it's a fake. In fact if I was devious, I could cover up the front and leave the remainder in the sun for a few weeks to make it match. I wouldn't want anyone to pay thousands and be ripped off
On the lookout for MISB Headmaster Highbrow, Takara or Hasbro. I'm sure I could make you a sweet deal!