"The most famous, and much coveted, Danish billboard is the Adamas Cigarettes billboard from 1928 made by Johs. Thejll of Copenhagen for American Tobacco Company. It was drawn by the Danish advertising illustrator Aage Lippert." says Danish billboard collector Søren Christensen at his site Emaljskilte. (Enamel porcelain coated signs)
You will find a couple of signs on this page and one here and here . Evidently the Adamas character that was created became such a success that they published books about him. However, according to Christensen, the cigarette brand never became a big hit and it seized to exist in 1942.