Austrian dating etiquette
I see in your book royal forms …but they are British. using the pattern you see in the British forms I provide will still officially addressed by their noble titles. I do not wish to be too formal, but I certainly do not want to be disrespectful. the Republic of Austria has no aristocracy since there is no reigning monarch and the nobility is no longer intact as it is in the UK, the Netherlands, or the UAE. If you don't know it might be good to address them by title ... If you know they like to be addressed as "Count" and "Countess" ...I have a British passport, and though my title does not appear in front of my names, it is clearly stated in the Information Section, above the names; "Holder is Count C--- V--- R----". On the French government's precedence list there are no members of nobility listed who have official precedence at official French events due to their noble title.
This has not been revoked, and, contrary to what most Frenchmen believe, hereditary noble titles have not been abolished.
You are quite right to say that noblemen are no longer officially addressed by their title but it can still appear on their passport, after the names, as " dit/e" or AKA," Le comte de...".
Thus the US Secretary of State would not officially address a who did not like being addressed as a baron saying was not legally accurate to use the titles with Austrian citizens, but if your guest likes it, use it in social situations.
E.g., he would not be officially introduced to the President of the United States as a , but it could be included as a point of interest in the introduction.
All that said, there would be a form of address in German, but I assume you want to address him in English. If his daughter is the eldest, she will inherit the title, but since he is still alive the title has not yet descended.