IGOR SIKORSKY(1889 - 1972) American aeronautical engineer and inventor of the first helicopter and multi-engined plane. Vintage S.P. 8" x 10" sepia, a head and shoulder portrait boldly signed at lower right: "I. Sikorsky May 31, 1937". Damage to right margin, light browning to margins, crease at center, just good. Estimated accordingly.