Ted Z is much more familiar with the Bond Bread issue than me but I can tell you that the squared corner Bond Bread cards surfaced around 1975-76. Only the natural round corner cards were known before then.
Though the square cornered ones are accepted through the hobby as vintage 1948, I always thought them to be printed in 1975.
As you can see from the T206 magazine cut out thread, I am not always correct.
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