Man offers $50K for 1955 Mickey Mantle card found at convention

It was a card collector's find of a lifetime.

At the National Sports Collectors Convention in Cleveland, Leighton Sheldon opened a vintage pack of 1955 Bowman Baseball Cards owned by his company Vintage Breaks. Collectors purchase spots in these packs for $500, hoping to find rare and valuable cards.

Sheldon found the most valuable in the set: Mickey Mantle.

"My eyes bulged out of my head," Sheldon said, according to Darren Rovell of ESPN.

Chris Rothe, a Maryland bookbinder, had purchased that spot in the pack, and he said the discovery was shocking.

"My friend told me my face went pale white when I saw it," Rothe said. "I was weak in the knees."

Rothe is selling the card, but he didn't expect the offers to be so robust. He received an offer for $50,000 after the card was given a grade of 9 (out of 10) from the Professional Sports Authenticator, the industry's main authority on card condition.