Hi,
It's certainly not beyond the realms of possibility that it is genuine as there are a number of examples of Kenner using different cardbacks for "testing" how the figure will look on display(ie bubble size and weight of figure/punch hole location, on the card etc).
One example is a Han Trenchcoat figure on an Emperors Royal Guard cardback.
Obviously i'd want to see the card for evidence of a reseal.Not certain if all figures tested in this way were ones with no copyright or whether some were regular figures.
Zoso.