Saint John on Patmos

ITALIAN SCHOOL, 17TH CENTURY Saint John on Patmos with number '23' and inscription 'No. No 401' (?) (verso) black and white chalk, squared in graphite, on two joined sheets of blue paper, watermark fleur-de-lys surmounted by a crown (cf Heawood nos. 1630, 1633 and 1641), shaped, the left corner cut and re-attached 7 7/8 x 22 7/8 in. (19.9 x 58.2 cm)