Bolivia – 1868 500c Nine Stars, original matrix on film, being the first step in the process to execute the reproductions, with notations on sides and base including « Alpha BCK » fil of the English brand « Ilford » used by Sperati before WWII, also « hiver » referring to the winter as the chemical substance used was probably reacting better at around 15° in his laboratory, with this being produced in January 1930, undoubtedly unique and the basis to produce clichés.