chemical reaction probably...the discolored gold border is the giveaway...if it was just missing the ink, the border would still be more "golden." But the border looks oxidized. I have a t-80 that is very similar.
the bright red back might be different as well. I am fairly certain that the inks used on the front were different from the inks on the back and tend to survive soaking better.
Or another theory...this was soaked prior to the back printing, meaning something spilled on the sheet before the back was printed (I am fairly certain the backs and fronts were printed separately).
Joshua
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