as long as there's a (possible) connection with Austria of today, there's no problem with your query on our board - we just need to mention it! ;-)
Being >sketchy< is ok, if you ask me, if that's the situation and you just don't have more solid facts. Quite normal with genealogical research, as we know.
There are btw. some 36 Dobner entries for Vienna in our phone directory at www.herold.at