3x10-3/8” mailing envelope with “Captain Midnight” return address has address label in proper place addressed to recipient in Chicago. Ovaltine 1942. Contains 1.5” dia., 6” long cardboard tube with images of “Official Wing And Tail Markings” as well as image of 3 kids using the plane detector. One end of tube is complete with cardboard insert centered by eye hole. Opposite end of tube is open for insertion of paper disks. All are 1.75” die-cut stiff paper. Includes High Altitude Distance Finder, Distance Finder Low Altitude, Air Speed Calculator and 4 with plane silhouettes and country names on insert transparent sheets. Includes United States-Flying Fortress B-17E/Republic P-43, England- Manchester/Spitfire, Germany-Kurier FW300C/Focke Wulf 187, Japan- Mitsubishi Type 97/Zero Fighter. Also includes 8-3/8x10-15/16” translucent sheet with instructions, additional plane detection images to be cut out and coupon at lower right to order more "Plane Detector Kits for 10¢ in coin and one seal from Ovaltine". Envelope has scattered lt. to moderate creasing from original mailing. VG. Tube has lt. creasing in center from original mailing with a few lt. color rubs. Still VF. Disks come with original small envelope and are N. Mint. Sheet has vertical center crease as issued. Un-cut and Exc. Incredible detail and high quality premium with nice graphics. One of the rarest and most sought-after Captain Midnight premiums, especially in this choice condition. The only complete, unused example we’ve offered in our 44+ years.