Estimated to be more than 500 years old and just 2.75 by 2.75 inches, the drawing known simply as "Head of a Bear" will likely be sold for $11 million to $16.5 million, the auction house said.

The drawing known as “Head of a Bear” was sketched on a square piece of pale, pink-beige paper measuring just less than 3 inches. The piece is believed to have been drawn around 1480.