Portrait of a man, bust-length

Italian School, 17th Century Portrait of a man, bust-length with inscription 'Guercino' (recto) and with numbers 'N? 127' and '127' (both crossed) and with further illegible inscriptions (verso) black chalk, pen and brown ink, silhouetted and laid down 6¾ x 5 7/8 in. (17.1 x 15.1 cm.)