- Milan, Biblioteca Ambrosiana, ms. A 27 inf.: page range 1r–83v
- Acquired: donated by John Duffy
- Film: 35mm Black-and-white Positive
NotesNote on the box: "Ambr. A 27 inf. (83 ff.) Commentary on the Prognostic. Pos."
Stamp on the side: "Department of Classics. State University of New York. Buffalo, New York 14214". Above the stamp (by hand): "Westerink".