"Eckerlin" trial proof blocks of four reverse image Admiral #108 3c in green, red, blue and black, oversize, lithograph reportedly printed in 1929 or 1930 by the German firm Herbst & Illig and submitted to the Canadian post office in an effort to secure a printing contract. Printed in sheets of 80, the right most column of stamps is only partially printed (shown on red and blue blocks here), the black block being a left margin copy. Numerous articles have been written about these "Eckerlin" proofs, which were not adopted by the post office. (Image)