This poster for Alfred Hitchcock’s The 39 Steps is one of the rarer entries in Heritage Auctions’ July 27-28 sale of posters, estimated at $10,000-20,000. (Photo:

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The one-sheet poster for the 1935 Gaumont-Fox film starring Robert Donat, Madeleine Carroll and Peggy Ashcroft, is estimated at $10,000-20,000.