I had a Zenith Space Command 300 b&w 19" portable TV in the late '70s. Rescued it from the curb in my hometown, and it worked well when I got it home--but, wouldn't you know it--the remote hand unit was missing, so I never was able to find out if the remote receiver worked. Didn't have the set that long anyhow, as the horizontal output tube went gassy after about a year, overbiasing the grid of the AGC keyer tube, causing a very weak, washed-out picture. Couldn't find a new tube anywhere, so I put it in my basement and bought a new (non-remote) Zenith 12" solid-state portable the next day. That set lasted the next 22 years; I'd still have it today, but I already have two TVs in my small apartment and don't have room for a third.
BTW, I like the pics of all those Zenith and RCA remote TVs. I especially like the Magnavox console with its power UHF tuner. That's the first TV I've ever seen with power up and down VHF and UHF tuning. The UHF tuner must have had a special arrangement to stop it right at the center of the channel for the best color picture (which wasn't easy to do with those earlier continuous UHF tuners when tuning by hand, let alone with a motor drive). An early signal-seeking arrangement, perhaps?
Today it's all done electronically, and every new set has search tuning; however, I'm curious as to how that set's power UHF tuner operated so well (as far as setting the tuner exactly to the center of the channel is concerned). Was there a separate signal-seeker chassis mounted apart from the tuner (part of the remote receiver)?