A 1939 comic book, where Batman makes his debut, sold for more than $1 million at an auction on Thursday (February 25), breaking the record for highest selling comic book.

According to the Associated Press, the comic was a rare copy of Detective Comics No. 27. It sold for $1,075,500 by Dallas-based auction house, Heritage Auction Galleries.

The buyer and seller both wished to remain anonymous.

"It pretty much blew away all of our expectations and now it's the highest price ever raised for a comic book," Barry Sandoval, director of operations of Heritage's comics division, told the AP.

Just three days before, a copy of the first comic book featuring Superman, a 1938 edition of Action Comics No. 1, sold Monday (February 22) for $1 million in a sale between a private seller and a private buyer.

Both comics were in great condition, said reports, scoring an 8.0 rating on a scale that goes up to 10.

Sandoval said the consigner bought the Batman comic in the late 1960s for $100. The comic features Batman swinging on a rope above city rooftops, with a bright yellow background.

Sandoval calls it "one of the most famous" comic book overs of all-time.

The previous record holder was for $317,000 a year ago, for a lesser grade copy of the Action Comics No. 1, featuring Superman.