Lot 50110 – Sweden – 1889 Official Issue 10 öre, Trio of items

Sweden – 1889 Official 10 öre, one master retouched negative on film, one glass support cliché dated June 1927 and one indigo cliché on celluloid dated August 1941, listed « 351 » by Sperati in his archive and with « 19 x 5% x 2’15 » denoting 19°C temperature, 5% of a certain substance and two minutes 15 seconds of sunlight exposure as the conditions under which he worked to obtain this result, a unique trio featuring two different steps in the production –no clichés or masters reported in other private collections-.