S & H GREEN STAMPS - HO and/or O-Scale. These trading stamps were popular in the US from the 1930s until the late 1980s. They were distributed as part of a rewards program operated by Sperry & Hutchinson. This sign has an additional set of contacts on the back for flush mounting the sign to the front or side of a building. Our S&H green stamps sign is the perfect companion to our window sign version (ME8890). Measures approximately 1.1” tall x 5.9” wide.