I also have an earlier CPG Berlin Dagor, a 240mm #260383. I'm pretty sure this one was made after the lens was recalculated to use newly available types of glass, but maybe not. It behaves very much the same as the 30cm.
Inoticed the date on your drawings, 1926. This was very close to the date Zeiss acquired Goerz and formed Zeiss-Ikon in 1926.