Catalogued in RISM as “Concertos–E♭ major; Manuscript copy; PL-Kc 100607 III” by Anonymus. RISM 1001198167
Same music
The one encoded movement matches a Schröter concerto in E-flat (RISM 400004943).
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 Allegro spiritoso · vl 1 · 8 of 8 pitches agree
2E{8EEFG}/{GAnEF}4F-/2F{8FFGA}'2E{8EEFG}/{GAnEF}4F-/2F{8FFGA}/{ABxFG}4G-/also RISM 850779832 1.1.1 All.o spiritoso
also RISM 850782549 1.1.1 All.o Spiritoso
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.