Leaves are wanting at the beginning and end, and some leaves are misbound.
Attribution to the Ambrosian rite is partly on account of antiphons called "lucernaria" (rubric "luc" f. 5r, etc.). Milanese saints including Victor, Nabor and Felix, Nazarius and Celsus, and Dionysius of Milan are commemorated.
There are 12 lines per page, the Latin text written in a gothic somewhat rounded book hand in black, the musical notation in staffless neumes on a usually 4-line staff of which one line is red. Rubrics are in red. Line-initials are in black, major initials in red or blue with pen-work decoration.
Bound in 2005 in full brown morocco over bevelled boards, tooled in blind.
MS Lat 389. Houghton Library, Harvard University.
Also available in an electronic version.