At first I had similar ideas. So I thought that the set might have mains EHT because of the ununsual construction of the power supply but it hasn't. The CRT is an early 1950s construction as you can see on the spec sheet of this tube:
http://frank.pocnet.net/sheets/030/m/MW31-16.pdf
Never the less the whole mechanical construction is really old school and nice to look at. That was the reason why I have posted this link.
Greetings Josef