Vintage Plastic Sliding-letter Puzzles

One artifact from my childhood in the 1960’s that I still remember vividly is the series of plastic slidingblock puzzles manufactured by The Roalex Company of Forest Hills, NY (no relation to the maker of fine timepieces). These consisted of a high-quality plastic puzzle glued to a piece of cardboard containing information about the puzzle. Most of their sixty or so different designs were based on cartoons or TV shows of the time, such as The Flintstones or The Honeymooners, and typically consist of a single drawing spread over all the tiles, or illustrations of four characters from the show, one in each column. Usually the picture on each tile is different, which means that, just like the Fifteen Puzzle, only half of the possible permutations of the tiles can actually be reached by sliding the tiles.