The pristine copy of Superman No 1, the character’s first solo title from 1939, was discovered in an attic in California last year

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.

The 1940 painting of Kahlo asleep in bed has surpassed the record set by the $44.4m sale of Georgia O’Keeffe’s Jimson Weed/White Flower No. 1 in 2014

A 1940 self-portrait by famed Mexican artist Frida Kahlo has sold for $54.7m (£41.8m, A$84.7m) at a New York art auction, setting a new top sale price for a work by any female artist.

El sueño (La cama), or The Dream (The Bed), which depicts Kahlo asleep in a bed with a smiling skeleton wrapped in dynamite on the canopy above her, sold on Thursday night at a Sotheby’s auction of surrealist art after four minutes of bidding.