The E. F. MacDonald Co.

1960s advertising agency from Dayton, Ohio. From source "The company was engaged in the business of creating and managing incentive programs to increase sales for its clients. These included developing sales objectives for sales personnel. In 1961 the company expanded its incentive services by entering into the business of licensing and administering the MacDonald Plaid Stamp Plan. The Plaid Stamps that E.F. MacDonald distributed were trading stamps issued to customers at grocery stores, drug stores, dry cleaners, service stations, and other establishments based on their purchases. ...These stamps were redeemable for merchandise at stamp redemption outlets owned by E.F. MacDonald."