I decided to take the plunge and collect the green tints about a year ago. I only have 3 left to go to complete the run. At first, I relied heavily on the wonderful side-by-side Flickr page that pointed out the differences for each card. But I found after a little while it got to be pretty easy to distinguish between the two, even for some of the more difficult cards (as long as the picture in the listing was halfway decent). I find it incomprehensible that a company like PSA would find themselves unable to quickly learn how to do this given it's their freaking business! That is embarrassing and shameful - especially given how much they charge for their "opinion" about the card.
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