Need help identifying if a card/rookie of Oscar Robertson
 

Good afternoon,

I recently came across a couple jumbo sized 8.5x10.5 cards of late 1950's Cincinnati Bearcat basketball players (including Oscar Robertson). When trying to do a little more research, I found a few football versions that were supposedly dating to circa 1958. I am trying to learn a little more about the actual cards/photos, if anyone can help date, and find out if this could be considered a rookie or not (unsure because they are so large). Supposedly they have a blank back...Any help/thoughts are greatly appreciated. Thank you!

This is Big O in college so I would not say rookie. 1958 works he was in school from 1957 to 1960 starting in the NBA in 60-61. For the Cincinnati Royals. What is on the back? could yo post it please might help identify.
Hope this helps Jonathan