Ted, I do not have a beef with you. But have you lately seen what Old Cardboard says about "1947 D305 Bond Bread" cards?
Today the website reads:
Set Summary
Produced in 1947 by Homogenized Bond Bread
Unnumbered, borderless set printed in black and white
Facsimile autograph is only labeling on each card front
Originally distributed with rounded corners and blank backs
Large stash found in 1980's with square corner variations
Cards (both rounded & square) often found in high grade
Compare Vern Stephens cards for each variation below
[showing both round (die-cut) and square corner cards]
https://oldcardboard.com/d/d305/d305.asp?cardsetID=1003
If you click on the links on that webpage to the Gallery, you see both round and square corner cards intermittently pictured. And they don't address the question of Sport Star Subjects cards that exist today.