That one is pretty straight forward. On the green tint version, the sky is a muddied brown color. On the 'regular' card it is basically white. So even if you have a b/w picture of the card, the darkness (or whiteness) of the sky will easily tell the tale. On a side note, there is also a superfluous blue vertical line in the top right corner of the GT. It runs nearly parallel to the right white border line for 1/4" or so. That's also a dead giveaway, as the sky is clear there on the non-GT version.
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