This 1941 Ovaltine premium is scarce and particularly so with the instruction folder. The item consists of a .75” dia. by 5” long red cardboard tube with metal device on one end which has a knob to swivel a reflective metal plate. Lettering on the cardboard cylinder reads “Captain Midnight’s Detect-O-Scope.” The item carries a separate metal piece inside the tube which can be pulled out revealing a series of 4 holes, each with an altitude designation printed next to the hole so that the piece serves as a way to estimate the altitude of airplanes. The instructions are a 2.25x3-9/16” folder which opens up into 4 panels with printing both front and back. Folder instructs on how to use the “Five-Way Detect-O-Scope” and these are: 1-as an airplane distance finder; 2-as a rear-sight periscope; 3-as a wide-view panorama scope; 4-as a cloud-sweeping, sky-scanner; 5-as a signal-flashing heliograph. Brochure also includes a coupon for ordering an addition example of the same premium for 10¢ and one Ovaltine seal. Mailer is Fine with address removed. Brochure has many creases but clean. The premium Detect-O-Scope is VF.