11x16" w/thin cardboard covers and six single-sided thin cardboard pages. No publisher indicated, but 1950s. Front cover has choice illustration featuring space scene involving the items that can be constructed from this book, including two spacemen, flying saucer and rocketships. Contents listed on the front cover are "Flying Saucer That Actually Fly, Giant 30" Rocket Ship, Ray Gun That Works, Space Helmet That You Can Wear, Space Phone Set That Actually Works, Robot Man Mask, Two Space Jet Planes That Fly, Accessories Ammo, etc." Inside front cover has detailed illustrated assembly instructions. Back cover features space helmet. A few loose perforations but all remains unused and intact including cello sheet behind mask on back cover. Cover shows just lt. wear and is VF while contents are NM. Superb graphics and wonderful design.