A collection of rare World War II posters featuring slogans such as Keep Mum - She's Not Dumb and Keep Calm And Carry On are to be auctioned.
The 150 morale-boosting propaganda prints are being sold by Wallis and Wallis Auction in Lewes, East Sussex.
Auctioneer Roy Butler described the collection as a "rare find" and expected it to fetch up to £4,000.
They were taken to the auctioneers by a relative of a worker who saved them from being thrown out by a print firm.
Mr Butler said: "They are all in mint condition and are a very rare find. I expect there will be a lot of interest from museums all around the country.
"I should think some of these posters may not have even been seen before so they are very special."
Mr Butler said there was "no real yardstick" on their value as he did not know of such a collection being sold before but expected each lot of about 10 posters to sell for up to £250.
Some of the prints feature extracts from Winston Churchill's speeches, such as "We shall not fail", while others carry warnings such as Don't Be Fuel-ish. Wasted Electricity Means Less Fuel To Make The Weapons We Need For Victory.