1959 Thhree Stooges Variants

I was scanning some new cards tonight and noticed a color difference in a pair of 59 Stooges. How common are these variants and has anyone ever catalog them?
Thanks
David
Thanks
David

It is always easier to fight for one’s principles than to live up to them-Adlai Stevenson
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Comments
If I remember correctly, the cards toned pretty quickly. I had some stooge cards in 1960 that had already tanned.
"All evil needs to triumph is for good men to do nothing."
Arthur
"All evil needs to triumph is for good men to do nothing."
Shane
Gray background. This is also the more rare Grey Back Card.
Green Background. Why is this card a 6????
Currently working on:
*1941 Double Play
*500 Home Run Rookie Cards
Always Upgrading
*1954 Dan Dee
*1959 Fleer Three Stooges
Fuzz
Currently working on:
*1941 Double Play
*500 Home Run Rookie Cards
Always Upgrading
*1954 Dan Dee
*1959 Fleer Three Stooges
<< <i> I would be interested in starting a PSA 9 set, if anyone has dupes for sale or trade. >>
David - good luck on that; that is one colossal undertaking!
"All evil needs to triumph is for good men to do nothing."
LINK
"All evil needs to triumph is for good men to do nothing."
<< <i> Looks like a labelling problem. >>
That's what I think also. PSA labled the card as a checklist even though it is just a normal back. I emailed Memorylane about this being a mislabled card (in case they didn't already know). The auction is still running though.
Scumbags....
"All evil needs to triumph is for good men to do nothing."