25 Silver Medals - The Official Manned Space Flight Emblems 17.5 Oz! Issued 1977-1979 Those medals were struck in the shape of the missions they depict! A set of 25 Sterling (.925 pure) Silver Proof Medals depicting major events in the early years of the NASA Space Program. The round medals are about 1.5'' in diameter and all medals weighs 0.7 ounces each (total weight of the medals is about 17.5 ounces). In their original wood frame. Including paperwork!