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-.