Hargrave Secret Service advertising card. Service located in Chicago, Illinois. Card advertises civil, criminal, commercial, store, factory, industrial, and personal investigations and shadowing for evidence for court or personal use. Printing is done in blue, white, and red lettering. On the left and right edges of the card is a blue, white, and red stripe. In the center of the card is an eagle holding a banner with “Hargrave Secret Service” printed on it, and the banner and the eagle are on top of a printed globe that says: “General Detective Business Transacted Everywhere.”

Measurement (in centimeters): 10 cm x 23 cm