hey Mike. i found that site too earlier today. the “gold rush” they are talking about (i think…) are those inserts that look nothing like the regular set.
on TCDb they list a “gold rush stamped” parallel (330 cards so i think only series 1) and they look exactly like the base set. they just have a “gold rush” stamp in the front similar to the inaugural rockies/marlins/etc sets
i can’t find info anywhere on those. maybe factory set inserts?
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