The most notable feature of the Torriani Book of Hours is most surely its splendid vermeil binding, produced by a Lombard crafts workshop.
This masterpiece of the art of the jeweller is noteworthy for its field of intricate gilded silver filigree work – with plant motifs, tendrils and volutes –, studded with eight medallions featuring the ivory heads of putti (four on each cover) and two ivory cameos on the front and back covers, representing Saint Catherine and Saint Lucy, respectively.

Binding (detail)		Binding (detail with head of putto)

The inside covers are also remarkably elaborate. They feature two painted enamel inserts representing Il bacio di Giuda (the Kiss of Judas) and l’Andata al Calvario (the Way to Calvary). The inserts feature engraved gilded silver frames bearing twelve small enamels with faces of saints.
The enamel work renders this already extraordinary work quite unique in that it is the only Milanese codex which brings together the arts of illumination and of painted enamel.