Vintage Friso Kramer and Wim Rietveld Reply drawingtable

Industrial design for Ahrend de Cirkel by Wim Rietveld and Friso Kramer in 1959. Grey metal frame with wooden workinsheet of 100,5 x 75,5cm. Adjustable in height and shiftable desktop.  Can be used as drafting table or as a desk. The condition is fairly good, the workingsheet has quite a lot traces of use, see for details the pictures.