A bifolio, and a small fragment of another bifolio, remnants of a choirbook containing Masses, motets, and secular pieces (original folio size probably c. 355 x 275); other fragments from same manuscript now NurS 9, although the repertory of this fragment is slightly later (CuthbertNMfrags) and Melk MS 749. See also the reconstruction of the fragments.
Copied by a single scribe, who also wrote NurS 9 & Melk 749. Possibly of south German or Austrian origin. Folios used c. 1460 by bookbinder Mathias aus Wien as binding material for astronomy manuscript treatise (Ptolemy: 'Almagest') owned by the mathematician and astronomer Johannes Regiomontanus (= Johann Müller) of Vienna. Regiomontanus later moved to Nuremberg; after his death (1476), his manuscripts passed to Nuremberg Stadtbibliothek, where 'Almagest' was catalogued as MS Centurio III, 25. Fragments with music were later removed from binding and now form the collection Fragment 9a.