Catalogued in RISM as “Concertos–D major; Manuscript copy; GB-Lbl R.M.21.c.10-15.” by Anonymus. RISM 800247349
Same music
The one encoded movement matches a Giuseppe Sammartini concerto in the same R.M. collection note for note.
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 Andante · vl 1 · 10 of 10 pitches agree
{8'A6.3FG}{8AB}{BA}4''G+/{8GFED}{'8A6.F3G}{8AB}{BA}''4G+/{8GFED}also RISM 800226002 1.1.1 Andante
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.