Graun, Johann Gottlieb
Concerto en Trio (Viol. d. Gamb, violino, basso) in G major, GraunWV Av:XIII:36
D-RH ms. 322
Güntersberg
Henzel (in Henzel, Christoph, Verzeichnis der Werke von Johann Gottlieb und Carl Heinrich Graun, Beeskow, Ortus, 2006) supposes that this could be an elaboration of a concerto for viola da gamba and orchestra.
In D-B Singakademie 3682 there is the same work for 2 violins and b. c.
Michael O’Loghlin, Frederick the great and his Musicians, The Viola da Gamba Music of the Berlin School, 1732-1772, Aldershot, Ashgate, 2008