A study of a bear's head by Leonardo da Vinci will go on sale at Christie's London on 8 July with an estimate of £8m to £12m ($11.2m to $16.9m). Measuring 7cm by 7cm, this silverpoint drawing on ...

2 1/4 x 1 3/4 x 2 3/8 3 1/8 x 5 1/2 x 2 3/8 3 3/16 x 4 1/2 x 3 4 x 6 x 4 1/2 ...

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.