My all-time favorite toy was “Jet TV”, an electromechanical precursor to today’s video games. Jet TV was very popular in the early 1960’s, quite sophisticated, even by today’s standards for mechanical devices.
For nostalgia buffs, the Jet TV has become extremely rare today, and you cannot find them at any price:
I think that I know why they are so scarce. I remember spend hundreds of hours playing with the silly thing, and eventually my curiosity got the best of me, and I dismantled it . . . .