Practica Musicae utriusque cantus, excellentis Franchini Gaffori Laudensis quatuor libris modulatissima

K. K. I. 2
The word "Catalog" is written in a different, likely later, hand below the shelfmark.
Catalog

Cp? Bui? et?, 1435.

K K. I. 2

I am of Amorbacchius, if you do not know.
I do not change my master.