Berlin, SBPK, Phill. 1776
From Clavis Canonum
Berlin, SBPK, lat. 97 (olim Phill. 1776) is the sole copy of the Berolinensis, a collection of early papal letters closely related to the Collectio Avellana.
Maassen, Geschichte 764-765; Rose, Katalog pp. 149- ; Schwartz, Publizistische Sammlungen 280ff.; Jasper, p. 61