Portraits by Vincent van Gogh

A previously unknown self-portrait of Vincent Van Gogh has been discovered behind another of the artist's paintings, the National Galleries of Scotland said Thursday.

The revolver with which Vincent van Gogh is believed to have shot himself sold for 162,500 euros at a Paris auction on June 19 nearly three times the estimate.

A painting by a young Vincent Van Gogh was sold at an auction in Paris on June 4 for more than seven million euros ($8.2 million), the Artcurial auction house said.