Original music vintage ad for RIVERSIDE RECORDS.  Fortissimo XK 8000 Series.  Pipe Organ, Jets, Banjo Polkas, Racing Cars.  Conventional surface noise is totally and response is phenomenal.  Chester Santon Light Listening. Stereo discs play from the inside out.  The tone arm starts right next to the label with a short band containing a 400-cycle test tone for channel balancing.  Once the locked grove at the end of this band is hurdled, the pickup then proceeds toward the outer edge of the record. 
Electronic Research and Development Division located at 235 W. 46th Street, New York City, 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.