Brake linings manufactured by the company H Douha-dor in Jemeppe sur Meuse, Belgium. Cappiello made two other sketches for this brand (Sketch 1, sketch 3). The third one was chosen for the lithograph.
Belgian brand of bicycles, motorcycles, and automobiles established in 1897. It specialized in luxury cars from 1920 onwards and became a competitor to Rolls-Royce.