Original General Post Office poster, If you haven't a clue about the service we provide…..consult the Post Office Guide, designed by Harry Stevens, 1980. A joyful design, featuring Sherlock Homes consulting the PO Guide. Harry Stevens was one of the most prolific and, in our opinion, talented poster artists working in Britain during the 1950s and 60s. He was a Fellow of the Society of Industrial Artists and winner of the Council of Industrial Design Poster Award in 1963. A higher resolution image is available for viewing on request.