This image is a copy of the official seal of the City of Chicago, Illinois, as designed and adopted by the City in 1905. As such, it is a work authored before 1922, and is therefore in the public domain. An 1895 edition of the seal can be seen here. This image is in the w:en:public domain due to its age.
Drawn by Marnanel, based on File:Seal of Chicago, Illinois.png. Wheatsheaf from File:Héraldique meuble Gerbe de blé.svg. Shield from File:US-Federal Civil Defense Administration seal (color).svg. Motto scroll from File:Georgian heraldry motto.svg.
http://www.chicagob2b.net/