Frederick William III of Prussia, 1770-1840. Oil painting on zinc. About 1820-30. Measures 23x18 cm, with original frame 32x26 cm. Excellent state of conservation. Zinc sheet was widely used as a support during the Restoration. It was then abandoned in the second half of the 19th century due to the problems caused by the so-called zinc leprosy, a process of deterioration, which occurred on poorly preserved works. In uniform on the back of a rampant gray steed, he indicates his destiny. In the same depiction of the famous general Napoleon riding David. The Prussian troops played a fundamental role in the victories against the French of 1813 and 1814 and the same know