It's amazing how many different details there are on our Sunset homes that "all look alike". This corner block and fluted casing is a detail I'm used to seeing inside Victorian homes.
It looks kind of strange on its own, but in context of the whole house it's okay.
My first thought was that it wasn't original. However the house next door has fluted casing, but no corner blocks.
And just across the street is a house with both. It is smaller, though, too small, I think.
A new detail I will be watching for in my travels.