Original vintage ad for HARMAN-KARDON INC.  Stewart Hageman, director of engineering pictured. Citation X speakers, the best speaker system.  Basic elements are the Lowther driver and the Hegeman enclosure design. It can perfectly reproduce the whole complex structure of a musical composition without adding or taking anything away from the original performance.
Main office was located in Plainview, NY.
This unique old one page 1961 high fidelity stereo component equipment trade magazine advertisement would display beautifully matted and framed.  It would make a nice accompaniment to your vintage stereo.