Lot 80031 – China, Local Post Shanghai – 1866 12ca, 20 items used to produce the overprint on the 12ca

China, Local Post Shanghai – 1866 12ca, 20 items used to produce the 12ca stamp with overprint, comprising five glass clichés of the stamp, incl. one black negative, two in shades of brown, and two very attractive in vermilion with comprehensive production notes around design noting issues pertaining to the violet filter used to obtain contrast in lithography, also one cliché on celluloid and six trial impressions on thin paper (black and brown); the overprint element is represented by one genuine overprinted stamp that Sperati used as his source for the reproduction (and touched up on reverse), also four glass support clichés, two showing the damaged “D” of the original overprint and the other two with repaired “D”, finally four papers with overprint trials, one with manuscript notations and dating “28/12”; an exceptional range of clichés and proofs of stamp and overprint, witnessing to the reproduction of this issue which was unknown until recently and represents Sperati’s only reproduction of Chinese philately. This lot comes with Sperati’s cardboard box for photographic papers of Guilleminot &Co.