these were so popular, that they were even made as a mini-model for something called Majo-kit (?).
It was a kind of Lego/Playmobil; consisting a whole street with sidewalks, trees, gas-stations, signs, traffic-lights...and these lamps. I played with it quite a long time ( as a kid

Yes Majokit. I had (and have still stored somewhere) that to and i liked those lamppost due to the fact they look as real lamppost in a mini version.