Catalogued in RISM as “Concertos–C major (Fragments); Manuscript copy; SI-Nf Ms. mus. 486” by Anonymus. RISM 540001081
Same music
The two encoded incipits match the Senfft concerto RISM 540001035: the anonymous opening Allegro is the keyboard part (incipit 1.1.2) of that copy's first movement.
Attributed copies compared (2 of 3 encoded incipits match):
1.1.1 Concerto. Allegro moderato · b · 17 of 17 pitches agree
8-/,{C'EDC},{BAGF}/{E6CD}{8ExF}{GD}{,,BG}/8-/{,C'EDC},{BAGF}/{E6CD}{8ExF}{GD}{,,BG}/1.2.1 Andante · b · 9 of 12 pitches agree
4,GAB/DEF/GEC/G,,DG/4,GAB/DEF/GEC/D,,DG/1.3.1 Vivace · b · no matching incipit among the attributed copies
{,8CCCC}/{CCCC}/{CCCC}/No encoded incipit matches this one.
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.