Lot 50620 – Switzerland, Canton Basel – 1845 2 ½rp, glass support

Switzerland, Canton Basel – 1845 2 ½rp, glass support cliché in black with image in reverse, showing the main design to be printed in black; a fascinating, rare, and beautiful component of Sperati’s highly sophisticated reproduction process for this world-famous stamp that required the use of three separate printing clichés plus embossing.