This is a sign that would have been used by a Plymouth dealership holding a summer sell-out sale of top quality used cars. The front announces the sell-out. The reverse has a dollar sign along with the words, Summer Sell-out. The sign was never used but it does show its age along the top where there is some wear and discoloration. Given its day-glo colors, we're guessing it was used in the late 1960s or early 1970s. It measures 18 inches by 10-1/2 inches.