What are signs that an old sign is a fake?

Old advertising signs are among the most commonly faked collectibles. Warning signs include rust that looks painted on or appears only on the surface, wear and scratches that look too even, bright colors that do not match the age claimed, and lettering or logos that do not match known originals.

Check the back and edges. Genuine porcelain signs typically show layered enamel and chips that reveal the base metal in a natural way. Many fakes are thinner, lighter, or have edges and mounting holes that look freshly made. Modern screen printing and digital printing often look different from older methods under magnification.

Because sign values can be significant, buy from sellers who guarantee authenticity and offer returns. Compare the sign with documented examples, and when spending real money, ask a dealer or collector who specializes in advertising to look at it first.