Historical Map: Underground Map at Strand Station, 1937
Passers-by looking at a pre-H.C. Beck Underground map outside Strand station in 1937. At a glance, it looks like the Fred Stingemore map, but expanded to show the whole system (the pocket card only showed central London). Parkland also seems to have been added – the large dark blotches dotted all around the map. Source: Londonist.com