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davidcyclebackThe backs and fronts weren't printed simultaniously, so it's possible for the front to be fine and the back to be off. Miscut backs with fine fronts can be found with modern cards too. Extremely miscut fronts or backs are scarce for all eras.
There are cases of extreme errors, such as the front and the backs being from two seperate issues. I have a few 1991 Fleers that have baseball backs and football fronts.