I am watching The Crown, and in the newer seasons, the royal family is shown watching TV in several episodes. Especially Season 3, Episode 7 is about the first moon landing, and there are multiple scenes in which the live reports of the landing are playing on a period-appropriate TV set.
I was wondering: is this a real piece of hardware playing real footage in the studio? Either a still-functioning vintage TV set, or a more recent ELT kinescope set into a vintage housing? And if it is real, how did they send the signal to it? Or is there just a non-functioning box in the studio, and the footage is added on top of it later?
I am interested not only in the exact constellation used in this exact show, but also in general, whether nowadays it makes more sense (economically? artistically? logistically?) to set up the real thing or to use digital effects.