Lot 50619 – Switzerland, Canton Zurich – 1843 6r, glass support

Switzerland, Canton Zurich – 1843 6r, glass support cliché with reversed image with a silver grey impression of the stamp design; a scarce and radiant cliché used to manufacture by lithographic process the technically very challenging final reproduction of the stamp (which Sperati appears to have worked on between 1942 and 1953).