A pattern is starting to emerge as BWolf goes two-for-two for the win (see what I did there?).
Mr. 24 is indeed a young Sean Connery, competing in the 1953 Mr. Universe contest. The story goes that during the event a fellow contestent told him of upcoming auditions for a touring production of South Pacific and suggested he try out for it. The rest, as they say, is history.
To wrap it up, here's a solo pic (which would have been the final clue had we not had a winner).