P-Cug (Coimbra) Biblioteca Geral da Universidade MM 1063 (20)
The proximity of the gradual Tollite portas and the tract Ave Maria would cautiously posit that portion of the fragment as pertaining to the feast of Annunciatio Mariae, on March 25th. The other chants, few and interspersed across different regions of the original page, do not allow more precise feast identification, although they all seem to pertain to commons of martyrs and/or apostoles.
Postmark: "Biblioteca Geral / Universidade de Coimbra".
Modern pencil inscription.
Square notation with black lines.