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John HarrellTypically it is the "aging" that gives them away. A real ad of this kind will have even toning, with no real splotches. Uneven toning is usually distinct (one part having been exposed and another, not) so that there appears to be a distinct line drawn (a newspaper that has had a portion exposed to air and the rest covered). I got many of mine from scgaynor before the glut of copies hit Ebay.
John