1.25" celluloid with metal covered back which includes a small spring clip. Celluloid includes serial number "2915." Cream colored celluloid has a little faint tan color around its lower outer edge but still displays Fine. The WPA was the largest and most ambitious New Deal agency and put millions of people to work on public works projects including buildings and roads plus they operated numerous projects in the fields of art, drama and literacy. The organization fed children and distributed food, clothing and housing. It operated between 1935 and 1943 although this item is from the earlier time frame using the name "Works Progress Administration" as it was renamed in 1939 Work Projects Administration. Only example we've seen of an officially issued staff identification badge.