374. AUGUST VON PARSEVAL (1861-1942) German airship designer, designed balloons used by the military for observation and rigid and semi-rigid inflatable airships. Rare S.P. "A. von Parseval", 5 1/2" x 3 1/2" b/w, an image of one of his airships with an inset photo of von Parseval, boldly signed on the face, with inscription (unsigned) on verso. Fine. ABPC shows only one example sold in 25 years. $300-500