Official United Nations Medallic First Day Covers 1971 Five Sterling Silver

  
The 1971 edition appears to be rare and includes: "The Seabed", "International Support for Refugees", "World Food Program", "Universal Postal Union", and "Elimination of Racial Discrimination". Stored in a box since 1971. About 4 Troy ounces of total. Happy to send additional photos or other information. I'm happy to send additional if desired.