Clearcoat on Clutch Knob?
I'm in the middle of cleaning my very first sewing machine, a 1928 Singer 66-6. In working on the hand wheel, I've noticed some spots around the edge on the face of the clutch knob that look like clearcoat has worn off. So, my question is whether Singer did put a clearcoat on chrome parts. Or, maybe they didn't even use chrome then, and it's just polished steel with the clearcoat to protect from rust?
If it is just a coating of shellac, that should be easy enough to restore after polishing. I'm just being extra cautious in my first project.