15th Century Graduale Romanum

There is an exsquisite item on auction at eBay: a 15th Century Graduale Romanum. The Roman Gradual contains the necessary Gregorian Chants for the Mass (Introit, Gradual, Alleluia, Offertory, and Communion), as well as the "Ordinary" of the Mass (Kyrie, Gloria, Credo, Sanctus, Agnus Dei).

This is truly a remarkable copy. To quote Indiana Jones: "It belongs in a museum."

(Biretta tip: Shawn Tribe from The New Liturgical Movement. Stop by his excellent page for always timely and insightful content.)