New York World's Fair 1964-1965 Vatican Medal

I have the following silver medal, 45 mm and 29.8 grams. The oberse shown Michelangelo's Pieta with his signature below. The reverse has the text NEW YORK WORLD'S FAIR 1964-1965 both in English and Latin. Above is a view of New York below the dome of St. Pauls in Rome. It als has the text PEACD THROUG BROTHERHODD and it is signed M.G.M. It is stamped with the fineness: 1000. There are no markings on the edge.

I cannot find any information about this medal. Who is the medalist, how many were issued.

There also exist two version in gold. See: https://www.numisbids.com/n.php?p=l...3105&lot=986