These were dipped at the manufacturer. I believe they were hung by the ball joint hole and dipped to various levels. This is the level Frank probably saw during the research on this car. I have heard of restorers getting several gallons of black enamel and floating it on a tub of water and dipping the parts and drawing them back out. Lots of runs, but that's the way they made them. I think AO Smith did frames this way, but it would take obviously a very large vat and many gallons of paint. Not many want to invest this much to duplicate runs in the paint.