​​​​Original old stereo vintage ad for  ACOUSTIC RESEARCH. INC. Main office and factory was located in Cambridge, MA. AR Turntable tested for 48 hours, includes measurements of rumble, wow, flutter, speed accuracy.  Shown are run-in racks. This unique one-page 1968 high fidelity stereo equipment component trade magazine advertisement would display beautifully matted and framed.  It would make a nice accompaniment to your vintage stereo.