In reply to tjekel:
Thank for the location correction Dachstein being in Styria. Regarding pitons, the Pichl route, the first route up the south wall was most likely done without pitons, however, there is plenty of evidence that the Steiner brothers were using pitons by 1909 when they climbed their more direct route up the wall. But I only note that later, pitons were considered valid for the route. Some of the earliest references to the use of pitons for climbing are in the Dachstein, in fact, but I included the beautiful south wall more to make note of a testpiece.
Regarding the topos, those are direct from the old journals! (1910 & 1937). I am sure those old topos got a lot of people lost back in those days!
Thanks to everyone who commented, really appreciate it. Next is the evolution of double rope technique, and even lighter and stronger gear of the 1930s as the popularity of big wall climbing exploded worldwide.