A Watch What Question

Investigator Joseph Schoolcraft writes [AIR 15:5]:

Perhaps one of your readers can help me identify the metal used to make the watch fob borne by the gentleman standing at the rear center of this photo. I have reason to believe he is none other then Helio More, the father of Drake More and uncle of Ramona Irton, both of whom are, I am sure, familiar to anyone who has read section 4 of chapter 62 of the 1962 edition of the classic physical chemistry textbook Bonds and Forces, Considered and Classified, by E.E. Merrill, T.K. Okha, and R. Falcone.