Lübeck – 1859 Issue featuring the face value error « Zwei ein Halb », group of 9 items including one glass support cliché, a celluloid cliché and 7 printing trials, with interesting annotations by Sperati dated in March 1941 and showing his progressive attempts to find the best chemical formula. The only group of proofs recorded, by far being the most important assembly of Lübeck in existence -as a demonstration of the significance of this lot, only one single definitive reproduction of Lübeck was offered in the « Ultimate » collection sale of Sperati-.
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