Asiatic Russia 1965 UA9KOH
This callsign was printed with cyrillic letters on it, so that a latin "UA" looks like "YA" and an H looks like an X. ...Tnx DL2LFH for the info.
Between 1950 and mid-1956, Soviet hams were not allowed to contact outside "Socialist Camp" (East Germany, Poland, etc.) Tnx RU3AX for the info.
Courtesy of W3CJF