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Signed at the limitation as issued. Additionally inscribed to Carl Engel, French-born American pianist, musicologist and publisher. Engel was also a writer on music for The Musical Quarterly, and chief of the Music Division of the Library of Congress. "At the time of its completion the present work was the longest piano piece in existence. Its duration is around four hours, depending on tempo. Several of Sorabji's later works, such as the Symphonic Variations for Piano (which last probably about nine hours of music) are even longer. At the time of its completion, the piece was possibly the most technically demanding solo piano work in existence due, for the most part, to its extreme length and rhythmic complexity and to the vast resources of physical and mental stamina demanded by its many passages of transcendental virtuosity, although some works conceived by New Complexity, modernist and avant-garde composers, along with Sorabji himself, were more difficult still; it is in this particular area that Opus Clavicembalisticum primarily receives its notoriety, and to this day is still highly regarded in that light." (Wikipedia) We can locate no copies in recent auction records or in the current trade.