The painting, which shows 13-year-old Mozart playing a harpsichord, smashed auction estimates when it went under the hammer in Paris on Wednesday.

A rare portrait of a 13-year-old Mozart will go up for auction at Christie’s Paris on November 27th and is estimated to fetch between $882,000 and $1.2 million.

Christie’s said Mozart’s father, Leopold, refers to the painting in a letter to his wife on January 7, 1770, in which he mentions that it was painted in two successive sittings.