Catalogued in RISM as “Symphonies–C major; Manuscript copy; GB-Lbl Add. 71539” by Anonymus. RISM 806252327
Same musicAttribution from a modern copy
All three movements match a C-major sonata for the same four string parts, but that copy was made and edited by Eugen Huber (1909-2004). The Fritz attribution needs its period source.
Catalogue flags:
Attributed copies compared (3 of 3 encoded incipits match):
1.1.1 Allegro · vl 1 · 12 of 12 pitches agree
''4C{8.C6G8.E6C}/'4G{8.G''6E8.C'6G}/4E{8.E''6C'8.G6E}/48.68.6''C{CGEC}/'G{G''EC'G}/E{E''C'GE}/8.6{Ct,B}gB2'C/1.2.1 andante · vl 1 · 11 of 11 pitches agree
''8C/G4bA8G/{6GnE}q8E4F'8G/{6GtnBBt''D}{6DtFFtbA}/8''C/G4bA8G/6{GnE}gnE4F8'G/6{GnBnB''D}{DFFbA}/848bAtGF/6{E'nB}gnB4''C1.3.1 allegro · vl 1 · 17 of 17 pitches agree
{''8C'''6C''G}{6ECD'B}/''8C'4G8F/{8E'''6C''G}{6ECD'B}/{''8C'''6C''G}{ECD'B}/''8C4'G8F/{8E'''6C''G}{ECD'B}/''8C4'E8D/6{CEG''C}{EDC'B}/{EG''CE}{GFED}/{'G''CEG}8{'''C''E}/{EtD}4-/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.