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On 1st January 2005 the firm of Otto Haas would have been under the ownership of Albi and Maud Rosenthal for exactly half a century. Albi’s passing on 3rd August 2004 deprived us of the pleasure of celebrating this particular professional anniversary with a special catalogue. The intervening period which was necessary for the reconstitution of Albi’s firm took us very close to another anniversary that Albi would certainly have regarded as infinitely more important than his own: the 250^th birthday of his spiritual and musical ideal Wolfgang Amadé Mozart. There is a  close correlation between celebrating this composer and commemorating the professional achievements of Albi’s life in this Jubilee catalogue. Albi first began to collect Mozart on his 21st birthday (5th October 1935) when he received a small autograph letter by him from his mother. This event contributed to his direction of the family tradition of antiquarian book and manuscript trade towards music. Among the thousands of music manuscripts and editions which passed through Otto Haas, Mozartiana always had a privileged place. It was Albi’s wish that his highly valuable collection of Mozart lifetime editions be presented to the country which gave him a second home after he had left his first. We have enlarged the remaining Mozartiana section in the Otto Haas stock with items from that in Stuttgart. The latter includes part of the Talleyrand collection with its Neapolitan, Parisian and Viennese roots, which provide further astounding antiquarian examples with regard to Mozart, his friends, acquaintances and enemies.