Aluminium construction. Allows a roll of paper to be used for continuous note taking/plotting. Incorporates a MK.1 rubber stopwatch holder at the top, stores ref. 5A/269. Fastens around the thigh using an adjustable leather strap that incorporates a fabric covered sprung section similar to those found on MK.III/IIIA goggles. Incorporates sprung wire pencil holders. Well made item. Soiled/grubby but in good used condition. Only ever had a couple of these rare early kneeboards. Stock code M18491.