Susan Fox, who runs Park Slope Parents, writes that she knows more about the neighborhood than she thinks, had this to say about the old fashioned barber shop on 11th Street and Seventh Avenue and the man who owns it. I peeked in there for years because of the old car for kids to sit in when they get haircuts. Susan mentions that, too.

The Clover Leaf Barber Shop owner is still alive, but no longer well enough
to open the store. He was in the hospital for a while and there was talk of
him being moved into an assisted living residence, but he seems to be well
enough to stay at his home (which I believe is in the same building).

They have a vintage wooden car in the Clover Leaf Barber Shop, and a poster
of an old old Yankees team.  It wasn’t the best kept place, but boy did it
have character. I miss it being open.  I saw a film crew there a few years
ago but never saw anything about it.