I've had a few '14's labeled as '15's and vice versa. QC isn't super tight there and it's not unheard of to have mechanical errors.
Anyone have a scan handy of the Heinie Wagner they labeled as Honus?
Here's a '54 Johnston and a '55 Johnston mixed up- a lot harder to confuse than Cracker Jacks. And it's the same submission so they had both in hand at the same time and still called them the same. I probably have a few dozen holders like this.