This lot comprises all four card issues in this 1950s series by Flip-Cards Inc. Each sheet is 11x13" consisting of a set of 21 cards. Each individual card is 2.25x2.75" and fronts feature art w/text on backs. At top left corner of each sheet is company title card noting set name and an issue price of 10¢. Additional text reads "Cut Them Out...Flip Them...Trade Them" and includes an illustration of boy and girl known as "The Flip Kids." Reverse of this title card has further information on the cards in this series and notes the "First Four Sets." Set titles are "Collector's Automobile" (Antique Autos), "Rocket Ships And Airplanes, The Three Musketeers By Alexandre Dumas, A Trip Around The Moon By Jules Verne." ACC#'s W670 1-4. Scattered trace of margin/corner wear including some lt. corner creases but all sheets remain uncut and w/clean card art. Overall sheets are Exc.