They hadn’t invented Photoshop yet, which makes this even more unnerving. Those faces look pasted in.

Wikipedia says about the Trio: “Era of Peak Success, 1957 - 1961.” This was the end of 1961. I’ll be honest: one of the taller guys could be Dave Guard, or could be John Stewart, who replaced Guard after he left in early ’61. It’s probably Stewart in the middle. If so, some interesting tidbits: he wrote “Daydream Believer” for the Monkees, got his start in a band with actor Tim Robbins’ father, and years after the Kingston Trio had passed, had a hit with a song assisted by the great Lindsay Buckingham.