The identity of R. Hayder (the artist did not write his first name in any of his prints) although he is known by some 3 dozen colour wood- or lino block prints to this day was never revealed. He is not mentioned in any of the known artists lexicons or address books. A relationship (acquaintance or apprentice) with Carl Rotky is suspected. Although not verified he is always “|mentioned” Richard or Rudolph Hayder. Without any documents Robbert of Robert also seems plausible. Awarding him with an entry in this gallery perhaps will change this faith.