5 April 1883.
Only recently.
Violin I and II, Viola, Violoncello.
Fellerer 1937b, p. 688; Hopkinson 1968, p. 65 (old shelf mark IX b); Mostra 1974, p. 17, No. 7 a; Magri 1974, pp. 304-305; Magri 1999, pp. 89-90.