FSH 1989 Russian Platinum 150 Rubles, 1/2 OZ

Have a 1989 Russian 150 ruble Platinum proof 1/2 troy ounce.
I'm selling it for a friend and I can find very little info on it in English.
Obverse is CCCP symbol, marked PT999, 15.55 (grams), 1989.
Reverse shows two armies facing each other across a river, what I presume to be 500th anniversary of something and a date at the bottom of 1480.
Asking $650.
I'm selling it for a friend and I can find very little info on it in English.
Obverse is CCCP symbol, marked PT999, 15.55 (grams), 1989.
Reverse shows two armies facing each other across a river, what I presume to be 500th anniversary of something and a date at the bottom of 1480.
Asking $650.
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Comments
The CCCP is the abbreviation in Russia for the Union of Socialist Republics and the former name of the Soviet Union.
Commemorates Great Stand on the Ugra River
Also, if you check the listing of Commemorative coins of the Soviet Union from wikipedia, this coin is the only 150 rubles for that date
Commemorative coins of the Soviet Union