This is a set of four mini plastic buildings. These are not stamped Cracker Jack but it is possible they are Cracker Jack prizes. They could also be cereal premiums. Each building is approximately 1" to 2 1/2" in size.
Welcome to Amy's Antique Attic...we buy and sell vintage and antique items, collectibles, and just about everything in-between.
I can be found on Facebook Marketplace and ship coast to coast but this page provides a sampling of what we have .