Hello,
I was very interested in reading all this questions and queries about Gubasta and Mathias. My father's grandmother was Josefa Illy, my father was Johann Mathias (Jovan/Ivan Matijas/Matjas depending on naming politics in former Yugoslawia), born 22.8.1922 in Brestowatz, he migrated to Germany in 1955. I have an envelop from July 24 1966, sender was Josef Gubasta, 136 ?? Marshal Street, Rice Lake / Wiscconsin, adressed to Josefa Illy in Berlin. As far as I know was she a Gubasta and married a second time.
Is this the "missing link" you / we are looking for?
I am living near Frankfurt/Germany. Any questions etc are welcome. I also will be glad to hear from you if you will have more details for me.