notes
The viola da gamba is not mentioned in either of the two manuscripts; however, there are some, if weak, indications in the part that support this destination.
A version for harpsichord or pianoforte and violin or flute was edited in: Johann Christian Bach, Six Sonatas for the Harpsichord or Piano forte with an Accompanyment for the Violin or german flute [...], op. XVI, London, Welcker, 1779 , and subsequent editions (RISM RISM, Einzeldrucke vor 1800, Kassel, Bärenreiter, 1971-2012 B350-357), n. 6.
bibliography
Peter Holman, Life after Death: the Viola da Gamba in Britain from Purcell to Dolmetsch, 2010
, p. 226
http://www.guentersberg.de/noten/en/g226.php
Ernest Warburton, The Collected Works of Johann Christian Bach, with Thematic Catalogue, New York, London, 1999
, pp. 29-32