One leaf, 555 by 385mm. On vellum. With six lines of music and verse in Latin written in brown ink.  The large initial “D” opening the text: “Domini est terra et plenitudo eius orbis terrarum…” from Psalm 23:1 (in the Latin vulgate) for the Vigil of the Nativity service, painted in colors with foliate border extensions in colors and gold. With two other initials in blue with red penwork decorations, one on each side of the leaf, opening text “Hodie scietis…”. (Some damp-wrinkling to leaf, with some rubbing to text, other discolorations and small stains, two tiny holes in sky on painted image.)