A rocky landscape with a castle on the left ( recto ); Geometrical studies ( verso )

ITALIAN SCHOOL, 17TH CENTURY A rocky landscape with a castle on the left (recto); Geometrical studies (verso) signed with initials ‘S.N.’ (lower right); ); with numbers and letters and inscription ‘Gradi’ (verso) pen and brown ink 5 ¼ x 8 1/8 in. (13.2 x 20.07 cm)