Lot 50587 – Spain – 1851 2r blue error of colour, a group of four

Spain – 1851 2r blue error of colour, a group of four exceptional items including a cliché on celluloid film mounted on clay and framed by rose felt (highly unusual), the cliché with part of the neck of the Queen cut out in order to improve contrast and traces of blue ink in the corners with fingerprints of Sperati; an exceptional piece which was highlighted by Sperati on this extremely rare production material. Additionally two clichés on protected glass, one produced in August 1939 with slightly blurred design at right, and a much improved version executed in February 1941 (clearly including three external frame lines on two sides), as well as a final signed reproduction used, type B of the two types produced by Sperati; a unique and most significant group with the genuine pair of the 2r error of colour being considered the most valuable item of Spanish philately, and one of the great aristocrats of worldwide philately.