DATE: Probably saec. xiv ex. - xv med. (Keskiaho 2010); saec. xv in. - med. suggested. ORIGIN: Probably according to liturgical use (Knuutila 1984). OTHER NOTES: Previously cited as: 'RIT 12' (Knuutila 1984). Previous shelfmarks: 'Manuale 12' (previously: 14).