Oh Henry Chocolate Bar Outdoor Billboard Advertising circa 1924 by Poster Advertising Co By Melanie | October 15, 2013 Oh Henry Chocolate Bar Outdoor Billboard Advertising circa 1924 by Poster Advertising Co Posted in CC License, Marketing and tagged 1924, Oh Henry, Poster Advertising Co ← Johnson and Stokes Seed Co Illustrations – Philadelphia circa 1890How Do Roots Grow? Antique Botanical Prints →