Lot 50520 – German States, Saxony – 1850 3pf, cliché on celluloid,

German States, Saxony – 1850 3pf, cliché on celluloid, with reversed image in splendid bright vermilion with additional colouring around the stamp design, showing faint impression of fingerprint, with dating “7/42” and production notations in the margin, “25° x 5%” to indicate the temperature of exposure and a percentage of some chemical substance used in the development of the film; a unique and dramatic component of the manufacturing process for this famous stamp.