Catalogued in RISM as “Symphonies–D major; Manuscript copy; I-Rc Mss. 6203” by Anonymus. RISM 850026336
Same music
The one encoded movement matches: Symphonies concertantes–D major (RISM 1001348889, 1.1.1 [p. 6, at left of the 1st stave:] SINFONIA II [above the 1st stave:] All|o moderato).
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 Allegro moderato · vl princ · 12 of 12 pitches agree
2''D'A/{6FE8D}{DD}{DDDD}/{3FG8.A}{8AA}{3FG8.A}8{AA}/4F2''D'A/{6FE8D}{8DD}{DDDD}/{3FG8.A}{8AA}{3FG8.A}{8AA}/{8FG}2.G/also RISM 1001379551 1.1.1 [p. 8, at left above the 1st system:] Allegro Moderato [at left of the 1st system:] SINFONIA | II.
also RISM 1001381521 1.1.1 [p. 4, at left of the 1st stave:] SINFONIA I [at left underneath the 1st stave:] Allegro Moderato
also RISM 240001379 1.1.1 Allegro moderato
also RISM 400011780 1.1.1 Allegro moderato
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.