R.A.F. Chartboard, Type 'B', MK.2. Stores reference 6B/137. Mnufactured by P.A.C. Ltd. Wooden plotting board approximately 44 x 44cm fitted with jointed/articulated brass plotting arm having an adjustable perspex rule. Green canvas pen 'pocket' to rear. Clearly marked to reverse with Air Ministry King's crown stamps, manufacturer's details and 1940 date code. Also has later re-issue date of 1953. Light marking and storage wear but in excellent condition and complete with its 're-issue' box. These were balanced on the knees of early navigators and used to plot routes during flight. Lovely display item. Stock code M20040.