Nevermind, found this amazingly detailed article that researched all the 1961 checklist photos. Looks like some NET54 members helped.
And yes it is Don Zimmer. Amazingly, Zimmer has cameo appearances on three different 1961 checklists! And with the many different variations for these checklists, I have a bunch of new cards to track down for my Zimmer collection.
https://www.number5typecollection.co...-and-1961.html