Lot 80126 – Tobago – 1880 6d, two extremely scarce glass support clichés

Tobago – 1880 6d, two extremely scarce glass support clichés, one in ochre and one in bluish-black, both with image reversal and coloured around the area of design to concentrate the light; two of just a handful of glass clichés in private hands, used by Sperati to manufacture his used reproductions on genuine watermarked paper which had the original design removed.