I had one of these view finders when i was a kid, it was really neat. Rectangular cards fit into a slot and gave you a 3-d view as it told a story in 7 panels with captions. Pushing down the button on the side advanced the card to the next picture. the cards had individual envelopes. I'm including; Mickey's birthday party D-1, Playful puppies P-1, Snow White and the 7 Dwarfs D-5, The 3 Little Pigs F-4 and A day at the Zoo C-1. There's also a postage paid comment card for suggestions on new topics. This 50's viewer and cards are in excellent condition.