Satoshi (Bin) Furuya who played the original Ultraman also says that he received an avalanche of fan letters addressed to his private home because it was openly shown in publication at the time.
As posted before, I can see each of the actors’ address shown in such publication for kids.
As I remember that Eiichi Kikuchi who played another Ultraman (“The Retun of Ultraman”) in later years says the same thing if I’m correct.
And I visited cartoonists whose addresses were shown in comic magazines around the same time as “The Return of Ultraman.”
So private addresses of famous people might have been easily and commonly shown until the 1970s.
I hear that Ryosaku Takayama who sculpted Ultra monsters also got a lot of kiddy fans in his atelier “Atelier May” which was named because the Takayamas moved in there in May.
It’s likely that Mr. Takayama also welcomed such kiddy visitors and showed them his atelier willingly.
It’s imaginable how much that made the kids’ eyes grow wide and shine.
Rather than mere customer service, the producers should have loved kids and been very much proud of their professional jobs.
It might also be because an idea of raising kids together still remained in society at the time.
Also, as Mr. Furuya says, it might show the single-mindedness between the producers and kiddy fans.