Great grandfather with last name "Belgrad". Of course anglicized when hit stateside. We do not know what was original. Not much is known about him or where from.
It appears as if the visor and the "cockade" on visor is of Russian origins. Does not appear to be Serbia/Yugo/Croatian at all. But I am not finding much luck on the double breasted uniform. Most i have seen look all to be single breasted in Russian Army....
Anyways, any pointers would be helpful!