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davidcycleback1800s sport and non sport color ad signs and posters were handmade prints, meaning there will be no multi color half tone dot pattern. Even under high magnification they will resemble color sketches or watercolor paintings. Thus, the 1800s signs, especially when the design are already known to exist (no chance of being a fantasy), are simpler to authenticate than modern ones. Reprints of famous 1800s signs and posters are easy to identify as they invariably have the multi color halftone pattern.