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Mewtwo VSTAR #79 Pokemon Go Keep track of your collection value over time

My following comments are speculation, but: The card designs could have been approved around the same time period as the first wave of 1996 cards, the contract could have enforced the release date of 1997 to stagger product hitting the market, the contract could have stipulated mew was to be withheld until approved, or indefinitely, or permission triggered by some other event such as a sales target

Chart shows the price of Karrablast [Poke Ball] #9 at the end of each month going back as long as we have tracked the item.

Also note that foil cards can be sun bleached as well