It could have been used in a grammar school classroom to show an educational channel show (ancester of PBS). See near the bottom of my TV page:
http://www.geocities.com/wa2ise/radios/tv.html and if geocities will let you
http://www.geocities.com/wa2ise/radios/classtv.jpg to see a 1960's era B&W TV on a tall stand in the back! of the classroom of my grammar school.