Keep Calm and Carry On poster sold for a hammer price of $12,000 (£9090) at Swann Auction Galleries in New York.

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The latest example of this much-imitated 1939 design was offered at Swann Auction Galleries (25/20/12% buyer’s premium) of New York on August 2.

Although virtually identical in graphic terms, a number of sizes exist (a surviving order form from His Majesty’s Stationery Office shows that the poster was printed in 12 different sizes overall).

This 1939 Swann poster was a 2ft 6in x 20in (76 x 51cm) example of which 496,500 were printed (but never issued).

With minor creases at edges and across the image, it sold on the phone to a collector for a low-estimate hammer price of $12,000 (£9090).

Another example of the same size in an Onslows December 2015 auction made £15,000.