I think the main difference in "Original" (OEM) in Cars and Bicycles is that with cars, the majority of the components were labeled or branded by the car manufacturer, where as the Bicycle it was mainly just the frame, and the components were from somebody else. This gives way to a lot of interpretation of what is correct or period correct.


However like cars, some people like to restore fully as if it just rolled of the manufacturing floor (Concourse), while others like to leave it untouched (except cleaning) retaining the patina of the years (Collectors), and then there are the ones that like to retain the style, but improve the performance with new parts and different paint (Hot Rodders)....

As long as you are having fun, there is no right or wrong, just enjoy!