[String Quartets] Amadeus String Quartet. (1947-1987) Signed Mozart String Quartet [K. 464] ScoreBoosey & Hawkes pocket score of the Mozart String Quartet A Major. K. V. 464, signed on the front cover by all four members of the quartet who performed together for 40 years without a change in personnel, a record exceeded only by the Beethoven Quartet. 32 pp. Complete, covers separating along the spine, a little toned, else fine. Scarce and very unusual in this format.