Lot 50509 – German States, Hannover – 1861 10 gr, cliché on celluloid

German States, Hannover – 1861 10 gr, cliché on celluloid in black and with reversed image, dated June 1938 and with further technical notations at base regarding the chemical treatment of Sperati’s preferred “Ilford Alpha” brand of celluloid that he used in the years prior to WWII. One of the six glass clichés known.