[Aviation] SIGNED FIRST EDITION. Octavo (21 x 15cm), pp.[6] 153 [1]. SIGNED by Sikorsky in blue ink to flyleaf. With four suites of photographic illustrations. Publisher's dark blue cloth, pink titles blocked to upper board and spine. With the pictorial dust-jacket priced at $2.50 to front flap. Toning and light spotting to endpapers and textblock edges. Some toning and faint spotting to jacket. Minor loss to jacket around spine crown. Gentle bumping to extremities. Very good. The biography of Russian-American aircraft engineer Igor I. Sikorsky, who invented models such as the Sikorsky R-4.