And here's some history on the manufacturer: The Green Duck Company, or the Green Duck Metal Stamping Company, was a prolific company that produced a wide variety of metal products, most notable among those being their political campaign buttons. Started in Chicago, Illinois in 1906, the company bounced around various Chicago addresses for nearly 70 years before moving to Hernando, Mississippi in 1975, closing it doors in 2004. During its heyday, from 1906 into the 1960s, the firm dominated the lithographed tin button business much like the way Whitehead & Hoag dominated the production of celluloid covered buttons. Both of these firms constantly expanded their product lines, Whitehead & Hoag going the direction of advertising specialty items predominately made of celluloid, while Green Duck’s products were primarily stamped from metal.
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Source: Scoop - Where the Magic of Collecting Comes Alive! - Green Duck Company Archives Offered at Hake?s