Which style/model Visionette is shown in this picture of child adjusting Visionette.
http://www.richsamuels.com/nbcmm/wma...pnewsreel.html
John, possibly your Visionette motor may also give a clue. Manufacturer, patent number/date etc
From the article of your previous post: One of my early jobs was finding a supplier of 900 rpm synchronous motors. We received samples from GE, Holtzer Cabot, and Emerson,
... Finally, Barber Coleman was able to supply one for about a dollar!