Catcher Danny Kravitz hit a "perfect grand slam" less than one month into his rookie campaign, May 11, 1956, turning a 5-2 Phillies lead into a 6-5 Pirates walk-off win. I suspect he retold this story often as the years passed, since an ongoing role as backup catcher limited his chances to impress Pittsburgh fans. This clean card offers a chance to join Kravitz at his peak, as it's graded PSA MINT 9 and the population report shows none higher.