PIRANESI Giovanni Battista (1720-1778) - "Dimostrazioni dell' Emissario del Lago Albano". Original etching. Signed "Piranesi F." in the lower right corner of the tablet. Ref: Focillon 491. Proof on strong laid paper, with the handwritten mark of the print dealer Naudet (active 1763-ca. 1830 in Paris) on the reverse, Lugt 1937. Plate IX, numbered in the composition at the top right, from the series of 9 pieces "Descrizione E Disegno Dell'Emissario Del Lago Albano Di Gio. Batista Piranesi", published in 1762. Margins. 44,5 x 59 cm. Condition D (two tears reaching the subject for 4 cm at the top and 18 cm at the right, trace of old vertical median fold, traces of wetness visible on the front and fold at the bottom left in the subject, restorations to be expected)