Here's a picture. AFAIK he was a member of the k.u.k. Austro-Hungarian armed forces. I see three stars and a diagonal stripe on his collar, and an armband on his arm, but I am lost at identifying it in more detail. Help would be appreciated.
Hello there! As your question is related to looking for identification/information regarding military personnel, our Guide on Military Identification may be of use to you. It provides a number of different resources, including how to request service records from a number of national agencies around the world, as well as graphical aids to assist in deciphering rank, unit, and other forms of badges or insignia. While the users here may still be able to lend you more assistance, hopefully this will provide a good place to start!