Wow... and I thought I'd seen everything in 1950s-60s appliances. Until I saw this thread, I had no idea that any such a thing ever existed.
Seems odd that the "High" position is out of sequence with the others, in terms of ordering by heat. I suppose that had something to do with the switches that were used, but I can't imagine what.
As I make it, you'd need a 20A circuit for one of these. If you had both burners on high, it'd be right on the edge for a 15A circuit at 230V, but back then a lot of utilities supplied houses at closer to 220. If you had two of these plus the oven, then you're talking about some fancy wiring by the standards of that day. Of course, back then, a lot of electricians would just pull one 50A circuit and attach everything to that.