A ‘Double Crown’ poster map of the Tube by Beck

A fine example of an early Beck poster map, issued two years after the first edition of 1933. The original diamonds for the interchanges have already been replaced with circles; a new escalator between Bank and Monument stations has been highlighted with a red sign; and an unnecessary 'North' pointer has been added top right, without Beck's knowledge. The pointer was the beginning of interference from 'upstairs'; later in 1935 Beck was ordered to introduce thick lines in the central area and large diamonds for the interchanges which had to include 'Station' for every name. Neither of these 'innovations' lasted past 1937.