Topps Push-Pull card Topps released their Push-Pull cards in 1965. There were 36 numbered cards in the set, each measuring 2-1/2 by 4-11/16 inches.

This unique item offered two photographs printed in such a manner that, using a shuttered overlay card, either one image or the other can be partially seen, but not both at the same time. The horizontal shutters in the top card act as window blinds, allowing the user to see one of the images through the holes or, if the small tab on the image card pulls it up or down, to see the other image. Each image is of a famous person, thing, or event.

The fronts of the image cards feature two black and white images, interlaced, with a color band at the bottom containing the name or description of the person or thing shown. The backs of these contain two paragraphs of text, each about one of the images, with the card number in a black circle at the upper left. The two cards are found separately in the package so taht one viewer card can be used with any image cards.

Note that there are a couple of the image cards dedicated to baseball players, so that baseball card collectors will compete for them with the non-sports enthusiasts, which means that the prices of these particular cards are much higher than for others in the set. The cards in question are #6, which has Mickey Mantle and Yogi Berra, and #17, which has Lou Gehrig and Babe Ruth.