Catalogued in RISM as “Concertos–B♭ major; Manuscript copy; I-Ria Mss. Vess. 1054” by Anonymus. RISM 854005778
Probable
The melody of Duo III (incipit 1.3.1, the opening of the third duet) of Gyrowetz's 3 Duets (print), a whole tone higher; RISM catalogues the anonymous copy as a concerto.
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 Allegro · ob 1 · 10 of 10 pitches agree, starting 2 pitches into the attributed incipit
'2.B4''D/2F4DB/GECF/D-4''C/2E4CE/2G4E'''C/''AFDG/E--{6FEDC}/also RISM 400007248 1.1.1 Allo con spirito
also RISM 400007475 1.1.1 Allegro con spirito
also RISM 402013291 1.1.1 Allegro con spirito
also RISM 410001188 1.1.1 Allegro con Spirito
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.