What a video!!
My parents current house had a very similar Hotpoint version of that disposall, would have been 1959 vintage. Ours was continuous feed though and the switch was on the wall to the right of the sink, painted RED with nail polish so nobody would mistake the disposal and light switches, although fumbling in the dark for a switch usually got the disposal switch before the light switch.
Our Hotpoint disposal expired in 1978 or so, and was replaced with the 1978 version of the disposal in the video. My mom was never much of a disposal person, so the GE mainly ate potato peelings, grapefruit skins, and occasionally chicken bones. Mom was always afraid of clogging the drain or jamming the disposal. She loved the batch feed though! The GE lived until 2003, well it started a decline in 2002, it would run for maybe 20 seconds and the overload would trip, one of the bearings would squeal every now and again. We replaced the GE with and ISE.
The disposal in the video is interesting, as even back then GE was making their disc and grind ring out of stainless steel. Also note there are no drain holes in the disc, the water ran out thru the holes in the grind ring. MOm's '78 GE had the same ring, but the disc was slightly different. These were good disposals.
I love the shots of stuff being ground, very cool.
Thanks Robert for sharing this with us!