This one is interesting, to me anyway. Bowman 1950 cards 181 to 252 can be found with or without the copyright on the back. Cards with no copyrights are tougher, and no copyrights from 181 to 210 are very tough to find.
Card 245 Papai can be found not only with copyright and without, but also with a blue arc on the bottom front. The arc versions are scarce but occur on both the copyright and no copyright versions, which is what I found interesting.
I think Thomas may have posted the arc version previously
