Here's the backstory behind the iconic "Keep Calm and Carry On" posters. Though 2.5 million were printed, they were never officially issued as they were reserved for crisis or invasion. 50 years later, Barter Books of Northumberland discovered a copy of the poster in a box of books from auction, and framed and hung it. They started selling copies a year later, and the rest is history.
The Story of Keep Calm and Carry On