I don't think anything happened after production to make these yellow, so I would trust your first "inclination" Leon. I used to collect R315s a few years back and still have some, although none of the yellows, which as you know are much tougher to find but not super scarce. I believe if anything the yellow have a darker looking back than the whites, from different tones of cream to almost gray, whereas the whites are just that on both sides for the most part.
I have seen a card or two like yours, and see where there's a Travis Jackson in ebay completed listings that's alot like yours. I would wonder whether some chemical or process was applied to make the fronts look yellow rather than just using a yellowish stock, and if so whether some excess of that chemical or process got inadvertently applied to the back during production. Here's the back of the Jackson:
__________________
Now watch what you say, or they'll be calling you a radical, a liberal, oh, fanatical, criminal
Won't you sign up your name? We'd like to feel you're acceptable, respectable, presentable, a vegetable
If we are to have another contest in the near future of our national existence, I predict that the dividing line will not be Mason and Dixon's but between patriotism and intelligence on the one side, and superstition, ambition and ignorance on the other.- Ulysses S. Grant, 18th US President.
Last edited by nolemmings; 10-24-2013 at 11:22 AM.
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