Watch List notes:

RUSSIA, Union of Soviet Socialist Republics. 1923-1991. Platinum 150 Roubles (28mm, 15.52 g, 12h). Leningrad (Sankt-Peterburg) mint. Dually dated 1978 and 1980. Discus thrower; Olympic symbol to right / Hammer and sickle on globe within wreath of grain. KM (Y) 163; Friedberg 183. UNC.