Zion Williamson 1-of-1 Rookie Card Hits Auction Block, Could Fetch $750K!!

A basketball card collector hit the JACKPOT -- pulling an ultra-rare, 1-of-1 Zion Williamson card -- and he's not wasting any time CASHIN' IN on the super valuable piece. Here's the deal ... an Australian fan ponied up $750 to reserve 1 card from a…

Zion Williamson 1-of-1 Rookie Card Hits Auction Block, Could Fetch $750K!!

A basketball card collector hit the JACKPOT -- pulling an ultra-rare, 1-of-1 Zion Williamson card -- and he's not wasting any time CASHIN' IN on the super valuable piece. Here's the deal ... an Australian fan ponied up $750 to reserve 1 card from a…