Yours is a Model 10ER. When Magna Engineering Corporation, the original company to make the Shopsmith, changed the model from 10E to 10ER they didn't redo the Name Plate to allow enough space for 10ER where 10E was so they just put ER on it. Later the Name Plate was redesigned and had 10ER as the Model.
The commercials you saw back in the 80's were for the Mark V. The Shopsmith Models 10E followed by the 10ER were made from 1947 through 1953. I remember seeing the Mark 5/V demonstrated at the fair and other places in the 70's and 80's. I knew right away I wanted one someday as soon as I saw it demonstrated but it took decades before I got one.
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ Shopsmith metal ends & retractable casters.