Uncommon fourth state of the first edition of Harry Beck's iconic Underground map, undated but likely published in August, 1933. It is the only 1933 edition to feature the north arrow and the L.P.T.B. logo.. The London Passenger Transport Board (L.P.T.B.) was founded in July 1933, whilst the escalator connection between Bank and Monument (not featured on this map) first appeared in September, 1933. This narrows the date of publication of this edition to July or August.

Harry Beck's now-iconic map of the London Underground was first issued to the public in January, 1933. A second edition was printed in February, 1933 to reflect the opening of Southgate and Enfield West stations. A third edition appeared in April, 1933 to coincide with the release of the first Quad Royal poster edition of the map. This fourth, undated, edition was issued around August, and there were two more editions in September and December, 1933. All of the 1933 editions are sought-after by collectors as they represent the beginning of the modern Tube map.

Printed colour.