Catalogued in RISM as “Overtures–B♭ major; Manuscript copy; US-NH Misc. Ms. 170, Filmer 29” by Anonymus. RISM 900001801
Same music
The 'First Treble Overture' matches the Overture of Handel's 'Tunes compos'd for the Play-house' for The Alchemist (HWV 43, drawn from Rodrigo), rhythm included.
Attributed copies compared (1 of 1 encoded incipit match):
1.1.1 · i · 10 of 11 pitches agree
4.''B8F4D{8EF}/2'A+{8AAGF}/4.''E8E4EF/2D''4.B8F4D{8EF}/'2A+{8AAGF}/''4.E8E4EF/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.