Sunlight exposure
Iggy, you bring up some interesting points for debate, but I do not believe this is a case for Hercule Poirot. I once left a 1959 Jim Bunning on top of a stack of cards near a window for over 5 years and the card faded. I will try and find that card this weekend and post a scan. As to value, a Sweeney missing ink sold for 1500 this year, so I would guess this one would go for around that.
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