I have a friend who is living in a Sears home bought and put together back in the 50’s. Many of the original components are still good.
Your friend’s house would not have been bought from Sears in the 50s because they stopped manufacturing them earlier. My house arrived on the train with all its numbered pieces, in 1922, and is still one of the strongest houses around. We have many in our area west of Chicago, a real tribute to their forward thinking of that time.
[I have a friend who is living in a Sears home bought and put together back in the 50’s. Many of the original components are still good.]
Could be a “Golden Key”. Very popular in the 50’s early 60’s. My dad put up dozens of them. Used to come on a trailer and then assembled on the jobsite.