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.

Trading stamps were popular in the United States, Canada, and the U.K. from the 1910s to the 1970s, but are no longer used. They are currently in use in Hong Kong.