The picture shows this Old Unused Diecut Butternut Candy Bar Advertising Store Window / Door Decal. I believe that this was for on the store window or door. I suppose it could have been used for a candy vending machine as well. It reads:
NOW! NOTICEABLY NEW BUTTERNUT
At it's widest points it measures 7" x 4-5/8". It is not dated but believed to be from the 1950's. It is in mint unused condition with the paper still on the back. There are two other similar ones advertising other candy bars in my items right now!