I'm pretty sure I regret every card I've sold. Two that are particularly disappointing are a Pittsburgh Exhibit Mantle and a 1952 Topps Mantle. I helped someone complete a run with the first and tripled my money on the second, but I'd rather have the cards and can longer replace them in my budget.
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Mantle Master Set - as complete as it is going to get
Yankees Game Used Hat Style Run (1923-2017): 57/60 (missing 2008/9 holiday hats & 2017 Players Weekend)
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