Harry Beck original vintage underground railway map 1960

Harry Beck original vintage underground railway map 1960. London Underground ‘Diagram of Lines and Station index by H.C. “Harry” Beck, dated 1960 in the bottom right of the front cover (see scan in Product Gallery.) Shows H.C. Beck imprint at the bottom left corner of the diagram. The last date of issue of a Harry Beck map. Printed by Johnson Riddle & Co. Ltd, St. Mary Cray, Kent. Size approx. 9 x 6 inches. Excellent condition. NOTE: Black mark on cover DOES NOT appear on the original.