I have discovered a new 1952 Topps variation.
I checked ebay and of the 52T Duke Sniders that are RED back there are two variations. Split about 50/50, (so I don't think one is less common than the other). Here are variations. Keep in mind these are both red backs.
Notice the border "break" lower left border. About half the "red back" Sniders have the identical "break" about half of the "red backs don't".
I claim the "discovery" here and now.
David Pierson