I found reference to a key start ( Your Keylectric") in an article a while back. No images,and I disregarded it as I was more interested in the ealier history in the Article. I had heard of a key start before,but have never seen one.
I have a funny feeling it may be a suppliment in one of my manuals, so ill have a peek and see...
Im assuming it made production due to your glossy advert. But like alot of new things,they may have never really taken off, were duds or just to expensive.
A good topic for the 60s fans to get into and a great topic for the archives... Another good score youve got VeeeCeee, Im sure others will chime in with some info....
I used to have a self propelled as per your picture,that I got from my grandfather years ago...