PIRANESI Giovanni Battista (1720-1778) - "Dimostrazioni dell' Emissario del Lago Albano". Original etching. Signed "Piranesi F." in the lower right-hand corner of the tablet. Ref: Focillon 491. Proof on heavy laid paper, on verso with the handwritten mark of the print dealer Naudet (active 1763-c. 1830 in Paris), Lugt 1937. Plate IX, numbered in the composition at 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 4 cm into the subject at the top and 18 cm to the right, trace of an old vertical median fold, traces of wetness visible on the recto and fold at the bottom left in the subject, restorations to be expected).