The picture below shows larger front and back views of this Old Miniature Premium or Prize Model Airplane Printed Envelope with Instructions. The glassine type bag is empty inside. This envelope was acquired many years ago is one of many Cracker Jack prize collections that were purchased. It pictures the model airplane which was probably made of balsa wood. It has the assembly and flying instructions. It may or may not have been used as a Cracker Jack prize. It has not yet been identified. The envelope measure about 3-13/16'' x 2. It appears to be in excellent condition with some wrinkling as pictured.