This particular pin is often referred to as a "Snoopy Hero Pin" or "Snoopy Hero Lapel Pin". It's a collectible item, particularly for fans of Peanuts and Snoopy memorabilia. The pin is made with enamel, a technique that involves applying finely ground glass enamel to metal and firing it to create a smooth, durable surface. These pins were produced by companies like Aviva, known for their vintage Peanuts merchandise