The Wayback View - Printing the London Telephone Directory - 1937

"The Telephone - A Sound Investment" promotional postage stamp canceling mark.
In the 1930s, telephones were still not in general use, so in 1937 the British GPO (General Post Office) Film Unit produced a short film on the production, and value, of the London Telephone Directory. The film "Book Bargain" was directed by Oscar winning Canadian film director and animator Norman McLaren.