A rare, nearly flawless copy of Superman's comic-book debut has sold for a super-powered price: $3.2 million.

New York comics dealers Stephen Fishler and Vincent Zurzolo said on Monday they submitted Sunday's record-setting bid in the eBay auction for Action Comics No 1, the 1938 book in which the super-hero first appeared. It's believed to be the highest price ever paid for a comic-book, surpassing $2.1 million for a similarly high-quality copy of the same book in 2011.

"It's hard to believe that a kid's 10-cent comic could be worth that much money, but it is Superman. That's an iconic thing," Fishler says. "It's the first time anybody saw what a superhero was like."