USSR gold coin «The 500 anniversary of the unified Russian state: St. Isaac's Cathedral, the XIX century, St. Petersburg» 50 rub., 1991, gold

Obverse: on top of the coat of arms of the USSR with 15 turns of tape underneath the letters "USSR", below left and right the hell under the dash to the left of the chemical symbol "Au" and the hallmark "900" metal made of coin undern

Reverse: left, top, and right along the rim of the coin, the words "500 years of UNITED RUSSIAN STATE", in the middle of St. Isaac's Cathedral in St. Petersburg, under the year of construction of the Cathedral "1858.", below along the rim the w