Well it could be ok in my book . I have two Kenner cards with the sticker on the back . One even has the Acbar offer sticker under it . Then one of the moc's where sent to Denmark and sold here .
One still have the danish price stickers on it .
I also think theres some info about the stickers on the palitoy site .
looking at the stress marks all over the sticker and the curl stress marks on the corner I would have to say that in my opinion it's been removed from the back and added to the front and not done at the factory stage