Leonardo's Signature, by Leonardo da Vinci (1452-1519). Page (Recto 89) from volume III of The Forster Codex. Italy, 15th-16th century
Codex Forster III (Milan, about 1490-1493) Victoria and Albert Museum / V&amp;A Prints http://www.vandaprints.com/image.php?id=68396
Leonardo da Vinci