Conjoined heads of Grace Kelly and Rainier III on the left, date below., Coat of arms of Monaco above the denomination, commemorated event above., A total of 5,000 of these coins were minted, and they are made of 0.920 gold. They were issued to commemorate the tenth wedding anniversary of Rainier III, Prince of Monaco, and the American actress Grace Kelly. They married in 1956 and had three children, including the current Prince of Monaco, Albert II., GRACE·RAINIER III DE MONACO / 1966, Xeme ANNIVERSAIRE MARIAGE