GK figures’ selling channel has being monopolized by several studios, they have their own nameplate to help identify if it’s real.
Then the workmanship, usually, real GK statues exactly the same with their advertisement while there have some differences with the fake ones.
Take LS Wu Kong as an example，below 2 pictures are real vs fake.
Real:
Recast:
Apparently, the price also can indicate, real GK statue must be much more expensive than a recast.