AEROSTATION - BALLON - "The Fourteenth Aerostatic Experiment of Mr. BLANCHARD, accompanied by the Chevalier Lepinard made at LILLE in Flanders, August 26, 1785". early 19th century. Etched by HELMAN (1743-1806), after the painting by Louis WATTEAU (1731-1798). Proof with the letter but without the dedication and the address, on laid paper. Small margins. 35,2 x 46,5 cm. Condition B (consolidated tear at the lower left corner in the margin of the copper and a short tear at the level of the board cut at the upper left, subject in good condition).