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You will always see initials on the size tag and those initials represent the Nike Sneaker Production factory it came from.
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You'll notice XC isn't listed there (probably just old/outdated post) but XC is another factory. It has been on almost every limited release and a little more regular release like RTTG LV or BHM 1 that isn't really stamped limited but I have never seen it on a GR. Unless someone can prove me wrong, XC just correlates to not being a GR by this occurrence.
maybe XC is just the factory that 1s are produced in....?