Trading stamps were small paper coupons, given to customers by merchants, that had a minimal cash value. Customers could save these coupons and exchange them with the trading stamp company for premiums. The use of these coupons grew with the proliferation of chain gas stations and supermarkets in the early 20th century. Two perforated sheets of "merchant's coupons" (possibly trading stamps) are included, one with fifteen stamps and the other with ten. The coupons in this collection have no markings to determine the merchant or trading stamp company of origin.