Trading stamp
Trading stamps are small paper stamps given to customers by merchants in loyalty programs, predating the modern loyalty card-based and online programs. Like similarly-issued retailer coupons, these stamps have only a minimal cash value of a few mils (thousandths of a dollar), but when a customer accumulates a number of them, they can be exchanged through the trading stamp company (usually a third-party issuer of the stamps) for premiums, such as toys, personal items, housewares, furniture and appliances.