This is an unmarked hemi signal in a color the real ones with the same embossing are known to come in, i.e.
CD 162 HEMINGRAY (F-Skirt) HEMINGRAY-19 (R-Skirt) MADE IN U.S.A. RDP
These will only cause our hobby grief through loss of members and loss of trust. I compared it to a real HG signal so you get an idea of the color and shape.
It sounds like these unmarked ones have been sold at a flea market in FL by the maker.
PS. This guy was not for sale at the Wheaton show, but it was unmarked.
Real on the left, Reproduction on the right.