Catalogued in RISM as “Concertos–C major; Manuscript copy; Hob V:C6; D-KA Don Mus.Ms. 1057” by Anonymus. RISM 450013911
Same musicComposer disputedAlready named in the record
The anonymous record already carries Hob. V:C6, a work listed under Haydn. Its opening matches the keyboard incipit (1.1.2) of the first movement of a Fils sonata (FuhM 12.3) note for note, so both names are in play.
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 Allegro moderato · cemb · 18 of 18 pitches agree
{''8.Ct'3BA}8{GA}{8.At3GA}{8G''6.C3C}/{8.Ct'3B''C}q6E4({6DC'BAGF};6){''8.C'3BA}{8GA}{8.A3GA}{8G''6.C3C}/{8C'6B''C}q8E4({6DC'BAGF};6)4F{8E''6.C3C}/also RISM 450016732 1.1.1 Allegro moderato
also RISM 450019664 1.1.1
Catalogue data and incipits come from RISM (Répertoire International des Sources Musicales), CC BY 4.0. Incipits are rendered with Verovio. Source and data: https://github.com/aaymeloglu/rism-attributions.