The Vintage SOSS Invisible Hinges Salesman Sample Display Board from Detroit, Mich. Is a unique piece of advertising memorabilia featuring the iconic SOSS Invisible Hinges brand. Made in the United States, the display board showcases a collection of hinges in various sizes, making it a desirable item for collectors of vintage advertising and merchandise. This piece would be a valuable addition to any store display or collection related to the history of SOSS Invisible Hinges.