Catalogued in RISM as “Overtures–G minor; Manuscript copy; S-SK 231:20.” by Anonymus. RISM 190008951
Probable
The Ouverture is the Ouverture of Mattheson's Suite douzième (D-B Mus.ms. 13905) a whole tone higher (transposed): G minor here, F minor there, rhythm included. RISM titles the copy G minor; the key signature has one flat, an older notation of G minor.
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 · vl · 10 of 18 pitches agree
''4.D8D4DG/4.C8C4C{8D'A}/4B''D4.G8A/2xF+{8FFGA}/4.B8B4BA/4.G8G4GF/4.bE8E4C''4.C8C4CF/'4.B8B4B{8''C'G}/4A''C4.F8G/2nEalso RISM 452010725 1.1.1 Ouverture.
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.