I have a lamp of my great grandmother’s that have the symbol around the base. I was concerned as a child that the lamp had Nazi connections. Gram assured me that the lamp predated Nazis, the shape was different and it came from shipments from Asia, our family had some import/export trade, and that the Step family that was Jewish was not the least bit concerned.
The base of the street light posts in our downtown area had swastikas on them when I was a boy in the 1950s. The lamp posts had been there since about 1910.