Did you ever collect “green stamps” or other brands of trading stamps? Retailers used trading stamps as a promotional tool for almost 100 years—from the 1890s to the 1980s. Customers earned stamps by making purchases. Then once they had collected enough stamps, they could exchange them for special merchandise. At the height of the stamps’ popularity in the 1960s, the vast majority of Americans collected them. Still curious? Read an article about trading stamps from 1956! https://www.newspapers.c