At first thank you for this very interesting and challenging puzzle! Compliment!
I know about the two different names of the company: "Austria Alpha" and "Austro Alpha". There were als two different emblems..
I fear not to know which name is the right one. Keep on searching in historic magazines of the 30's.
The photo, taken in the streets of Vienna, is from 1938
To raise confusion, I added some pictures depending the name of the company