[Exhibitman]

I got a response from Chic Hess, the author of a book on the Passaic HS teams and Professor Blood, ID'ing the people on the Exhibit card:

Here are their names from left to right: Prof Ernest Blood, Fritz Knothe, Fred Merselis, Michael Hamas, Samuel Blitzer, Milton Pashman, Assistant Coach Amasa A. Marks.

So, the card represents an early [first? only?] card of HOFer Ernest Blood. Fritz Knothe was a major league player, with the Braves and Phillies. Mike Hamas went on to play basketball at Penn State.