Giovanni Francesco Barbieri, known as Guercino (1591-1666), Portrait of a man leaning on a book, c. 1650, red chalk on paper, 23x17 cm Provenance: Luigi Calamatta (1801-1869) (L. 1717). Anonymous sale, Sotheby's, London, 22.04.1998, lot 38. With Galerie Yves Mikaeloff, Paris, from where acquired by the present owner. A Swiss Private Collection Lots 26 to 30, 2697 to 2701, 2703 and 2705 to 2707 marked in green in the printed catalogue come from a private Swiss collection. The collection is made up of high quality old paintings and drawings painstakingly assembled over almost 40 years (see page 33 of the printed catalogue). We would like to thank Benjamin Peronnet for writing the notes on the drawings in this collection.