Google Books has entire copies of American Motorcyclist
online. You can browse them and word search them. I found Harley's ad for my 1963 sportster, and a review in a later issue that showed factory paint styles and logos. Sure, they were in black and white, but they still give you a good idea of what's original and not. You can also find lists on various website and in books that tell you what paint colors were standard for each year/model. Hope that helps.