In my early 1950s house, I decided to upgrade the bathroom
outlet fixture to a GFCI, 20-amp circuit.

When removing the old, metal outlet box, I found that the
ground wire to the outlet was connected to a screw in the
back of the box. The separate bare wire coming down from
the attic, was "connected" to the box by a couple of turns
around one of the nails holding the box to the stud!

This surely wouldn't meet any code in the USA today (I don't
think), but it was obviously not a modification.

So either it met code at construction-time, or it was not
properly inspected during construction.

I'm curios as to which situation was true.

--
croy