This Pop is 100% authentic. Why? 1) You can see at the bottom the official sticker that was found on all pops sold in Japan during that period, with the correct labeling too. 2) The "Movies" label is of the correct wide font. You can see this YouTube video on this differentiation from fakes: https://www.youtube.com/watch?v=w7rZ6BW_TrQ
You can tell from 2) that many current and past listings are fakes, including one that sold at $1000!
However, please note that Leonida's helmet is discolored, despite being stored in optimal conditions. I have seen many other real ones with this discoloration. (I can provide links to listings local to my country.) For those that don't have it, it's highly probable that they are either fakes, or are older photos.
Will shipped double boxed and insured.