29 Vintage Pizza Hut Pins promoting their pizzas as well as programs such as Book It, popular in the '80's. There are 3 holograph pins, Back to the Future, Kid's Night, and Book It. The rest are a mix of sizes and sayings. 

Note: I'm not an expert on dates produced, or if the 'Got Books' pin was issued by Pizza Hut or another reading program, but I'm including it for a total of 30 pins.