Up, up and away: Superman comic found in attic sells for $9.12m to become most expensive ever sold

The copy of Superman No 1 from 1939 which now holds the record as the world's most expensive comic book after selling for $9.12m on Thursday. Photograph: Heritage Auctions

A copy of Superman No 1 that was discovered in an attic in California last year has become the world’s most expensive comic book after selling for US$9.12m (£6.96m, A$14.14m).

Superman No 1 was published in 1939 and was the Man of Steel’s first solo title. It marked the first time a character that debuted in a comic book had their own title devoted entirely to them.