Our extended family, while on a family outing, stopped at a Hardee's Fast Food Joint. On the wall near the counter where orders are placed was a nice picture of one of the early Buildings with their sign. The interesting part of the sign was a triangle part on top that rotated (if memory serves me) with their main advertisment, "Hamburgers 15 cents". And I think I was the only one that had seen such signs when that price was accurate.
Another example was on a car I bought in my late teens. It was a '69 Chevelle SS396 with 4 in the floor. It was a year old and still had the "window sticker" in the dash. The NEW on the lot price was under $4,000.00. A similar type car today would run at least 10 times that price.