Haimann has a particular interest in unusual items sent through the mail. This shoe sole in his collection was sent by first class mail from Maryland to New York in 1937. The sender wrote the address on one side and wrote his message on the other side. The sender did not apply enough postage to properly pay for the weight of this shoe sole to go through the mail, so three 1-cent postage due stamps were applied, with the recipient paying the due amount.