Catalogued in RISM as “Quartets–B♭ major; Manuscript copy; S-L Saml.Kraus 157” by Anonymus. RISM 190001882
Unresolved
The anonymous 'Sinphonia ... a 4' opens with the pitch sequence of the Allegro assai (incipit 1.3.1), an instrumental section before the first recitative of Pietas in Deum, rebarred from 3/8 to 2/4, and diverges afterwards.
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 Allegro · vl 1 · 12 of 20 pitches agree
'8B''4D8C/'B4F8D/''D4F8E/D'4B8F/{''6BFFF}{FFFF}/{'FA''CF}{EEEE}/{DDDD}{DDDD}/'8{B''DC}/'{BFD}/''{DFE}/{D'BF}/''6{FFFFFF}/{FFFFFF}/{FGABAB}/4FCatalogue 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.