NavList:

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This is an RAF version of the Dalton Navigational Computer of the 1930s.  Thousands were produced in various forms during WW2.  They were succeeded by the much slimmer Mk4 slider model.  They were a piece aircrew personal equipment carried by the aircrew member, never normally part of an aircraft inventory.  Some would have been used in the air, many would only have been used for training on the ground.  I was in two Air Cadet units in the late 50s early 60s, and both units had a cupboard full of them for use in air navigation lessons.  This is the desktop model.  There was also a kneepad model for pilots and/or for use in smaller aircraft.  Unfortunately, it’s assumed that things will sell better if they are associated with the name of an anachronistic and much loved aircraft.  No doubt if this had been a kneepad model, it would have been a 'Spitfire' computer.  The chances of this particular DR computer having seen the inside of a Lancaster are, without provenance, fairly slim.  DaveP