#15. 1951 Bowman Willie Mays #305 PSA 8
See the card here.- Category: Baseball- Market value: $243,520- 5-year ROI: 240%- 10-year ROI: 2,599%The Say Hey Kid’s rookie MLB card is highly coveted. Produced by Bowman, it’s a horizontal card with prized artwork of Mays at-bat. That year, he…