Lot 50107 – Sweden – 1855 3s including the error of colour, group of eleven items

Sweden – 1855 “Tre Skilling” error of colour, group of eleven items including one master negative with painted surround to avoid the light to diffuse laterally, three glass support clichés in brown-orange (2) and red, one dated 6/41 with the notation “amon” chemical 6% with minutes 30 seconds exposure to light under 18°C temperature, one with notation “voile vio” indicating violet filter was used which also intensified the yellow-brown in this cliché numbered 424, the other noted a usage of 6% chemical, with a exposure to light of 1 min 10 secs at 17°C temperature; also four clichés on celluloid, two in yellow and both dated 2/48 annotated “t. II”, one in red dated 4/49 with the hand note “Pose insuff” for insufficient exposure to light and indeed this cliché illustrating a weak image with a lack of definition, one in black dated 2/51 and 5% chemical used and 3 mins light exposure, also included are a finish reproduction of the error of colour signed in pencil on the back by Sperati, and two final reproductions in green, one of which is mounted on a part album page with a note from A. Brun indicating he thought the margins had been added and a pencil note by Sperati saying “comical”; the master negative included in this lot, it is as usual very important as the foundation for the production of the clichés; for many oh his reproductions Sperati used genuine, common stamps including those with proper perforations, watermarks and correct cancels for the period and after applying protective coatings to the genuine cancel, he chemically treated the stamps to remove the design before using his clichés for printing his design onto the final reproduction; a unique collection of master and working clichés illustrating part of the work and techniques he undertook to reproduce one of the most valuable and iconic errors of worldwide philately; only the B.P.A. reports just one cliché in its collection, whereas this lot does not only include seven clichés, but also the important master negative; the “Ultimate” collection had just one example of the finished colour of error reproduction and no clichés, and the Postal Museum in Paris has no clichés for Sweden.