Original technical drawing for the Drum cone mould ( which would make 6 impressions per shot ) for the GMC Concrete Truck, later issued as K-6. The mould makers would use that drawing to make the actual mould. Drawn on 21.3.1969 (!) - two years befor the model was issued! Was certainly planned as King Size model and the transition to the new Super Kings wheels delayed the introduction.

Format about 125 x 77 cms, folded.