The razor wire and armed guards outside - hints that something important lay inside, possibly even precious.

The rare Mantle card was in mint condition.

Known as the Marvel Comics #1 “pay copy,” it's “arguably one of the top three comic books in the world.

The seller, Mark Michaelson, bought the comic in 1979 from its original owner.

It told readers about the origins of Superman, how he came to Earth from another planet.

"The reason I took up the graphic novel project was because I admire Ellis's writing & story of Emilio Bacardi (whose father founded Bacard...