CHICAGO (CBS) — The owner of a 50-year-old comic book is finding that Spider-Man can spin a web of gold.

When George Toman brought a bag full of old comic books from his childhood to Chimera’s Comics in LaGrange, he thought he would get about $10 for the whole batch.

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But when the store’s co-owner, Steve Brown, looked through the bag, he found part of the Holy Grail for comic book collectors.

“Anyone who works in the store is going to know what the book is,” he said. “They will recognize the cover. It’s a famous book if you know comics.”

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It turns out it was an original of the 1962 comic that first featured Spider-Man. Brown says Toman had no idea what he had.

“His mother must have put them up in the attic with all the other comics, and he just forgot about it,” said Brown.

Brown is now selling the comic on consignment.

“This is definitely the highest-ticket item in the store,” he said.

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It could fetch between $10,000 to $15,000, Brown said.