View of 1911 Roberts 50 h.p. airplane engine. Typed on back: "Harry Ford, 445 Stratford Ave., Bridgeport, Conn. 1911 Roberts 50 h.p. aeroplane motor." Handwritten on back: "I swapped a big 4 cyl. Columbia car with Mr. Roberts at Grand Central Palace N.Y. in 1911 for this motor. H.F."