Posted By:
jay behrenswe've had this discussion several times as to what is a variation and what is an error. Technically, it boils down to this, an error is something like Irv Younf being pictured on a card labeled Cy Young and the mistake never corrected. A variation is something like the the t206 Magee portrait where the name was initially misspelled and then corrected at a later date.
Your's fall in a bit more nebulous area. as most likely, the sheet got flipped around before the back got printed, thus creating wrong backs. This is more a printing/manufacturing error and some would consider the cards printer scrap. Interesting items, none the less. I just picked up a 1941 Play Ball card of Lefty Gomez with a Babe Dahlgren back.
Jay
My place is full of valuable, worthless junk.