Scrabble—Board games were also quite popular in the fifties. The game’s big break happened when the president of Macy’s, Jack Strauss, played the game on vacation. When he returned and found that the game was not sold in his stores, he placed a large order, and Scrabble quickly received national attention.
Play-Doh—This squishy toy was actually invented as a wallpaper cleaner. The inventor’s sister, however, started letting her kindergarten students use it in crafts as an alternative to harder and messier clay. Play-Doh, now owned by Hasbro, has sold over 900 million pounds, and the exact formula remains a secret to this day.
Pick-Up sticks -- Even more low-tech than View Master, Pick-up sticks (or pick-a-stick) is a game of physical and mental skill in which sticks have to be removed from a pile without disturbing the remaining ones.
Cap Gun -- Cap guns were originally made of cast iron, and used rolls of caps that contained tiny gunpowder charges that fired when the hammer struck the charge, automatically advancing the roll of caps to the next shot. The popularity of Western heroes like the Lone Ranger helped boost the popularity of cap guns.
*Most information taken from an article in "Toy Reviews and News, July 2008