London Underground vintage map by Harry Beck 1957

London Underground vintage map by Harry Beck 1957. Original 1957 map by H.C. “Harry” Beck, dated 1957 to bottom right of front cover (see scan in Product Gallery.) Shows H.C. Beck imprint at bottom left corner of diagram. Central Line extends to North Weald, Blake Hall and Ongar. Printed by Johnson Riddle & Co. Ltd, St. Mary Cray, Kent. Size approx. 9 x 6 inches. Excellent condition.