Andreas Höfeld from Germany pointed me in the direction of type designer Otto Eckmann, also from Germany. Eckmann designed a number of fonts in 1900, that appeared with the Klingspor Foundry. The regular font contains echos from Roberta (or the other way around, I do not know which of these fonts was first) and the old handwritten texts made by monks. Especially the captital T, with the sickle-like stem.The alternate font looks more like the lettering found in the Berlin Zoo. The latter font could have been modified, bij adding the peculiar top on the "o". I made a print (click to enlarge) with the fontset downloaded from the website Andreas mentioned:
