Procopius by David Nalle is a match.

Nice! I wonder what the metal original was?

That’s Post-Antiqua. It was designed by Herbert Post in 1932 for the Berthold type foundry in Berlin.
http://www.myfonts.com/fonts/berthold/post-antiqua-bq/
Procopius is a match, but the spacing seems to be corrupted, try Ja … or type in nbnjn. The side bearings have probably been set on an equal value, calculated from the x-extremes. The apostrophe, the quotes and the @ look as if they were taken from Arial. The euro is missing etc. …

Thanks Albert for finding the original. I always feel a bit uncomfortable with Scriptorium David Nalle fonts. Never know if it's an original design or it has been redrawn. That's also why I used "a match" thinking the original would show up...

The Scriptorium collection seems to be haunted with ‘redrawn’ versions of well known typefaces. Palatino, ITC Garamond, Friz Quadrata, ITC Benguiat, Americana, Trump Mediaeval … Just to name a few.

In light of the above, I changed the solving credit to Albert Jan. I hope you don't mind, Ryuk, thanks for your effort as well!

Is it just me or have both of the digital versions significantly tempered the most unique aspect of the type on the title page, the extreme letter widths on A and W?

It's interesting looking in Jaspert's "Encyclopaedia of Type Faces", because that book shows "Post Roman" as a Berthold typeface from 1937 that seems to match this sample. It has a lower case, but the showings include "Post Title", which is all caps. The Medium weights of each face has a very wide A and W, noticeably wider than in the Light and Bold weight versions.

The digital "Post-Antiqua" seems to have called the Bold version "Medium" and has only two weights now.

- Mike Yanega