Came across this DBS in a friends basement, left by a previous tenant, and I inherited it when he moved out. I know they're sort of Norway's version of Huffy, but I'm wondering how common they are in the US?

The rebuild is underway, and I'm cleaning and re-greasing all bearings and shining up all the chrome and aluminum. I'm considering re-painting the frame, but I'm afraid to cover up something that shouldn't be covered up. The paint is very worn, but it's still rather neat. Any thoughts? What approaches have you taken with unique, but obviously worn original paint?