The gold scrollwork on a Featherweight (and other older Singers) are waterslide decals, applied over the paint, then clear coat is applied over it all. The decals for a Featherweight are readily available from ebay and online sellers.
I don't know who painted my Featherweight purple. The person who owned it at the time lived in Houston, gave it to her daughter, the daughter moved to Portland to live with Dad and go to school, so decided to sell the FW on craigslist. I was in the right place at the right time to see the ad when it was first listed and going to Portland the next day. I wish I knew more. I have read people have their own repainting done in an automotive shop. Strip, clean, mask off, prime, paint, new decals, clear coat. I'm sure you could find out more by Googling.