(n. p.): Sikorsky Helicopter, . 1st printing. One sheet, printed both sides, folded 4x vertically, forming a 10 panel brochure. Illustrated with 6 drawings, one cut-out image of the turbine engine & a two-panel color photographic image of the S-61L in flight over downtown Los Angeles. Folded: 8-1/2" x 3-5/8". Unfolded: 8-1/2" x 18-1/4". Self-wrappers. Brochure - Fine. Artwork - VG (signs of use, as to be expected). Item #39623
"The Sikorsky S-61L is the first helicopter specifically designed as a commercial short haul airliner, and the first multi-turbine helicopter certified for passenger service by the Federal Aviation Agency."