This is a small figural Superman pencil sharpener sold by a company named Alco in 1978. Alco made a number of different school supplies with various DC superheroes including pencil sharpeners as well as notepads. This plastic sharpener portrays Superman bending a steel girder; it’s a little weird that the girder is part of a paper label instead of sculpted. These were originally sold carded; I’ve seen Batman and Wonder Woman versions as well. This item isn’t particularly rare or valuable… just the kind of thing you might be lucky to find for 50 cents or a dollar at a flea market.