All the way counter clockwise - Left (US drivers side) parking lights front and rear (if you parked on a narrow road and the car was in the road a bit so others could see your car)
one click clockwise - Right side parking lights
---- note the above two will not work if the key is on, only if the key is off
two clicks clockwise - straight vertical (but after 45 years it might not be exactly vertical any more) is everything off
three clicks clockwise - all parking lights & license plate light & dash board lights on
four clicks clockwise - headlights on also
-- Here you can pull the switch out and this would turn on your fog lights if you had them, is will come out 2 clicks, there are two circuits but I think only one was ever wired.
Although the switch is a different shape it is the exact same operation as MB Headlight switches into the '90's perhaps beyond.