That museum looks exciting!

> Pre-WW2 televisions seem to be quite rare

Pre-war television was rare. Electronic television came to maturity during the Great Depression. Early TVs were horribly expensive and given the economic situation of the 1930s almost no one could afford them! The UK started regular TV broadcasts in 1936 and by 1939 there were about 20,000 televisions in the whole country. And that was much further along than France, Germany, or the USA.

Most of those 20,000 were scrapped or sold during the war or they served as TVs faithfully into the 40s and even 50s, and then were retired. There are only a handful of working televisions of that vintage in the world.