1961 Mickey Mantle error card.. looking for advice

[RSteamboat]

A few months ago I was going through a box of 61 that I hadn’t opened in a long time. I noticed something odd on the back of one of the cards (Ted Kluszewski #65) Mickey Mantle is printed underneath the stats of Ted!!! WTH! Shocked to see my favorite player hidden amongst the common folk. It is printed upside down compared to front of card. There are no smudging on the print. It is clean and crisp. I don’t think it could be a wet transfer because of how clean it is and the fact that is upside down….

PSA and Beckett have both looked at the card and are unwilling to grade it. PSA stated to me that they were not willing to start a new category and they’ve never seen anything like this before.

At this point, my conclusion is that an employee improperly placed a sheet into a press and printed the front of the cards on the back of a sheet. It continues
through the production line because it is now in my hands so in my opinion, there’s gotta be at least one sheet that’s double printed. I have No evidence to support my claim it is just my opinion but seems like the only logical answer.

comments?

Thank you for your feedback
Stem