Monaco - 1975 - Silverv1/2 Franc -  Mintage 62,500 - (BU) - Rainier III (May 31, 1923 – April 6, 2005) was the Prince of Monaco from 1949 until his death in 2005, ruling for nearly 56 years. He became the sovereign prince at the age of 25 after the death of his predecessor, Prince Louis II. Known as the "Builder Prince," Rainier III transformed Monaco into a global symbol of prestige and culture, significantly enhancing its economy and infrastructure during his reign